frontend 2.0: initial version

- auto refresh function - light and dark theme - monaco editor (vscode) with "apex" as syntax highlighting language * apex seems to work quite fine (better than no highlighting) * future possibility: own plantuml language syntax support * future possibility: autocomplete (to much work but maybe partial) - implemented example for `!theme ...` - implemented example for `<&icon>` * future possibility: code validation - implemented example for `@start...` and `@end...`: * should be the first or last command * should be of the some type (e.g. `@startyaml` and @endyaml) * should be used exactly once per document/diagram - editor and preview is splitable into two windows like the "Extract window" functionality on (plantuml.com)[https://www.plantuml.com/plantuml] - multi index / multi paging diagram support - diagram can be displayed/rended as PNG, SVG, ASCII Art or PDF - Ctrl+s download the PlantUML Code as code file (diagram.puml) - Ctrl+, opens the settings and Esc closes the settings
2024-12-21 08:19:04 +00:00 · 2023-04-29 00:29:29 +02:00 · 2023-04-29 00:29:29 +02:00 · f727c6dd13
commit f727c6dd13
parent 763976abdd
46 changed files with 2638 additions and 761 deletions
--- a/.editorconfig
+++ b/.editorconfig
@ -0,0 +1,19 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+indent_style = space
+indent_size = 2
+trim_trailing_whitespace = true
+
+[*.java]
+indent_size = 4
+
+[*.md]
+max_line_length = off
+trim_trailing_whitespace = false
+
+[*.puml]
+insert_final_newline = false
--- a/.gitattributes
+++ b/.gitattributes
@ -0,0 +1 @@
+* text=auto eol=lf
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@ -2,21 +2,23 @@
    "java.configuration.updateBuildConfiguration": "automatic",
    "cSpell.words": [
        "Arnaud",
+        "buildx",
        "ditaa",
        "endditaa",
        "enduml",
        "epstext",
        "etag",
+        "ghaction",
        "Lalloni",
+        "monaco",
        "plantuml",
        "Roques",
        "servlet",
        "servlets",
        "startditaa",
        "startuml",
-        "utxt",
-        "ghaction",
-        "buildx"
+        "undock",
+        "utxt"
    ],
    "cSpell.allowCompoundWords": true
 }
--- a/pom.jdk8.xml
+++ b/pom.jdk8.xml
@ -56,7 +56,7 @@
    <plantuml.version>1.2023.6</plantuml.version>
    <!-- Please keep the jetty version identical with the docker image -->
    <jetty.version>11.0.7</jetty.version>
-    <codemirror.version>5.63.0</codemirror.version>
+    <monaco-editor.version>0.36.1</monaco-editor.version>

    <!-- dependencies -->
    <jstl.version>1.2</jstl.version>
@ -71,7 +71,9 @@

    <!-- Testing -->
    <junit.version>4.13.2</junit.version>
-    <htmlunit.version>2.53.0</htmlunit.version>
+    <selenium.version>4.8.3</selenium.version>
+    <selenium-webdrivermanager.version>5.3.2</selenium-webdrivermanager.version>
+    <commons-io.version>2.11.0</commons-io.version>
    <jetty-server.version>${jetty.version}</jetty-server.version>

    <!-- build plugin management -->
@ -106,8 +108,8 @@
    </dependency>
    <dependency>
      <groupId>org.webjars.npm</groupId>
-      <artifactId>codemirror</artifactId>
-      <version>${codemirror.version}</version>
+      <artifactId>monaco-editor</artifactId>
+      <version>${monaco-editor.version}</version>
    </dependency>
    <dependency>
      <groupId>jakarta.servlet</groupId>
@ -175,9 +177,21 @@
      <scope>test</scope>
    </dependency>
    <dependency>
-      <groupId>net.sourceforge.htmlunit</groupId>
-      <artifactId>htmlunit</artifactId>
-      <version>${htmlunit.version}</version>
+      <groupId>org.seleniumhq.selenium</groupId>
+      <artifactId>selenium-java</artifactId>
+      <version>${selenium.version}</version>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>io.github.bonigarcia</groupId>
+      <artifactId>webdrivermanager</artifactId>
+      <version>${selenium-webdrivermanager.version}</version>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>commons-io</groupId>
+      <artifactId>commons-io</artifactId>
+      <version>${commons-io.version}</version>
      <scope>test</scope>
    </dependency>
    <dependency>
@ -365,9 +379,9 @@
              <artifactItems>
                <artifactItem>
                  <groupId>org.webjars.npm</groupId>
-                  <artifactId>codemirror</artifactId>
-                  <version>${codemirror.version}</version>
-                  <includes>**/lib/*.js,**/lib/*.css</includes>
+                  <artifactId>monaco-editor</artifactId>
+                  <version>${monaco-editor.version}</version>
+                  <includes>**/min/vs/loader.js,**/min/vs/**/*,**/min-maps/vs/**/*</includes>
                  <outputDirectory>${project.build.outputDirectory}</outputDirectory>
                </artifactItem>
              </artifactItems>
--- a/pom.xml
+++ b/pom.xml
@ -56,7 +56,7 @@
    <plantuml.version>1.2023.6</plantuml.version>
    <!-- Please keep the jetty version identical with the docker image -->
    <jetty.version>11.0.7</jetty.version>
-    <codemirror.version>5.63.0</codemirror.version>
+    <monaco-editor.version>0.36.1</monaco-editor.version>

    <!-- dependencies -->
    <jstl.version>1.2</jstl.version>
@ -71,7 +71,9 @@

    <!-- Testing -->
    <junit.version>4.13.2</junit.version>
-    <htmlunit.version>2.53.0</htmlunit.version>
+    <selenium.version>4.8.3</selenium.version>
+    <selenium-webdrivermanager.version>5.3.2</selenium-webdrivermanager.version>
+    <commons-io.version>2.11.0</commons-io.version>
    <jetty-server.version>${jetty.version}</jetty-server.version>

    <!-- build plugin management -->
@ -106,8 +108,8 @@
    </dependency>
    <dependency>
      <groupId>org.webjars.npm</groupId>
-      <artifactId>codemirror</artifactId>
-      <version>${codemirror.version}</version>
+      <artifactId>monaco-editor</artifactId>
+      <version>${monaco-editor.version}</version>
    </dependency>
    <dependency>
      <groupId>org.eclipse.jetty</groupId>
@ -153,9 +155,21 @@
      <scope>test</scope>
    </dependency>
    <dependency>
-      <groupId>net.sourceforge.htmlunit</groupId>
-      <artifactId>htmlunit</artifactId>
-      <version>${htmlunit.version}</version>
+      <groupId>org.seleniumhq.selenium</groupId>
+      <artifactId>selenium-java</artifactId>
+      <version>${selenium.version}</version>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>io.github.bonigarcia</groupId>
+      <artifactId>webdrivermanager</artifactId>
+      <version>${selenium-webdrivermanager.version}</version>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>commons-io</groupId>
+      <artifactId>commons-io</artifactId>
+      <version>${commons-io.version}</version>
      <scope>test</scope>
    </dependency>
    <dependency>
@ -346,9 +360,9 @@
              <artifactItems>
                <artifactItem>
                  <groupId>org.webjars.npm</groupId>
-                  <artifactId>codemirror</artifactId>
-                  <version>${codemirror.version}</version>
-                  <includes>**/lib/*.js,**/lib/*.css</includes>
+                  <artifactId>monaco-editor</artifactId>
+                  <version>${monaco-editor.version}</version>
+                  <includes>**/min/vs/loader.js,**/min/vs/**/*,**/min-maps/vs/**/*</includes>
                  <outputDirectory>${project.build.outputDirectory}</outputDirectory>
                </artifactItem>
              </artifactItems>
--- a/src/main/java/net/sourceforge/plantuml/servlet/PlantUmlServlet.java
+++ b/src/main/java/net/sourceforge/plantuml/servlet/PlantUmlServlet.java
@ -36,6 +36,7 @@ import jakarta.servlet.http.HttpServletResponse;

 import net.sourceforge.plantuml.OptionFlags;
 import net.sourceforge.plantuml.api.PlantumlUtils;
+import net.sourceforge.plantuml.code.NoPlantumlCompressionException;
 import net.sourceforge.plantuml.png.MetadataTag;
 import net.sourceforge.plantuml.servlet.utility.Configuration;
 import net.sourceforge.plantuml.servlet.utility.UmlExtractor;
@ -134,8 +135,15 @@ public class PlantUmlServlet extends AsciiCoderServlet {
        final int idx = UrlDataExtractor.getIndex(request.getRequestURI());

        // forward to index.jsp
+        final String path;
+        final String view = request.getParameter("view");
+        if (view != null && view.equalsIgnoreCase("previewer")) {
+            path = "/previewer.jsp";
+        } else {
+            path = "/index.jsp";
+        }
        prepareRequestForDispatch(request, text, idx);
-        final RequestDispatcher dispatcher = request.getRequestDispatcher("/index.jsp");
+        final RequestDispatcher dispatcher = request.getRequestDispatcher(path);
        dispatcher.forward(request, response);
    }

@ -183,6 +191,10 @@ public class PlantUmlServlet extends AsciiCoderServlet {
            if (text != null && !text.isEmpty()) {
                return text;
            }
+        } catch (NoPlantumlCompressionException e) {
+            // no textual diagram source available from Url
+            // ignore and try 2. method (metadata) below
+            // do not spam output console
        } catch (Exception e) {
            e.printStackTrace();
        }
@ -229,26 +241,16 @@ public class PlantUmlServlet extends AsciiCoderServlet {
     */
    private void prepareRequestForDispatch(HttpServletRequest request, String text, int idx) throws IOException {
        final String encoded = getTranscoder().encode(text);
-        final String index = (idx < 0) ? "" : idx + "/";
        // diagram sources
+        request.setAttribute("encoded", encoded);
        request.setAttribute("decoded", text);
-        request.setAttribute("index", idx);
+        request.setAttribute("index", (idx < 0) ? "" : idx);
        // properties
        request.setAttribute("showSocialButtons", Configuration.get("SHOW_SOCIAL_BUTTONS"));
        request.setAttribute("showGithubRibbon", Configuration.get("SHOW_GITHUB_RIBBON"));
-        // image URLs
-        final boolean hasImg = !text.isEmpty();
-        request.setAttribute("hasImg", hasImg);
-        request.setAttribute("imgurl", "png/" + index + encoded);
-        request.setAttribute("svgurl", "svg/" + index + encoded);
-        request.setAttribute("pdfurl", "pdf/" + index + encoded);
-        request.setAttribute("txturl", "txt/" + index + encoded);
-        request.setAttribute("mapurl", "map/" + index + encoded);
        // map for diagram source if necessary
-        final boolean hasMap = PlantumlUtils.hasCMapData(text);
-        request.setAttribute("hasMap", hasMap);
        String map = "";
-        if (hasMap) {
+        if (PlantumlUtils.hasCMapData(text)) {
            try {
                map = UmlExtractor.extractMap(text);
            } catch (Exception e) {
--- a/src/main/java/net/sourceforge/plantuml/servlet/PlantUmlUIHelperServlet.java
+++ b/src/main/java/net/sourceforge/plantuml/servlet/PlantUmlUIHelperServlet.java
@ -0,0 +1,174 @@
+/* ========================================================================
+ * PlantUML : a free UML diagram generator
+ * ========================================================================
+ *
+ * Project Info:  https://plantuml.com
+ *
+ * This file is part of PlantUML.
+ *
+ * PlantUML is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * PlantUML distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
+ * License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
+ * USA.
+ */
+package net.sourceforge.plantuml.servlet;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.StringWriter;
+import java.io.Writer;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+import java.util.stream.Collectors;
+
+import javax.xml.parsers.DocumentBuilder;
+import javax.xml.parsers.DocumentBuilderFactory;
+import javax.xml.parsers.ParserConfigurationException;
+import javax.xml.transform.OutputKeys;
+import javax.xml.transform.Transformer;
+import javax.xml.transform.TransformerException;
+import javax.xml.transform.TransformerFactory;
+import javax.xml.transform.dom.DOMSource;
+import javax.xml.transform.stream.StreamResult;
+
+import jakarta.servlet.ServletException;
+import jakarta.servlet.http.HttpServlet;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+
+import net.sourceforge.plantuml.theme.ThemeUtils;
+import net.sourceforge.plantuml.openiconic.data.DummyIcon;
+
+import org.w3c.dom.Document;
+import org.w3c.dom.NodeList;
+import org.xml.sax.SAXException;
+
+/**
+ * Small PlantUML frontend or UI helper.
+ */
+@SuppressWarnings("SERIAL")
+public class PlantUmlUIHelperServlet extends HttpServlet {
+
+    private interface HelperConsumer {
+        void accept(HttpServletRequest request, HttpServletResponse response) throws IOException;
+    }
+
+    private final Map<String, HelperConsumer> helpers = new HashMap<>();
+    private String svgIconsSpriteCache = null;
+
+    public PlantUmlUIHelperServlet() {
+        // add all supported request items/helper methods
+        helpers.put("icons.svg", this::sendIconsSprite);
+        helpers.put("icons", this::sendIcons);
+        helpers.put("themes", this::sendThemes);
+    }
+
+    @Override
+    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+        request.setCharacterEncoding("UTF-8");
+
+        final String requestItem = request.getParameter("request");
+        final HelperConsumer requestHelper = this.helpers.get(requestItem);
+        String errorMsg = null;
+        if (requestItem == null) {
+            errorMsg = "Request item not set.";
+        } else if (requestHelper == null) {
+            errorMsg = "Unknown requested item: " + requestItem;
+        }
+        if (errorMsg != null) {
+            response.addHeader("Access-Control-Allow-Origin", "*");
+            response.setContentType("text/plain;charset=UTF-8");
+            response.getWriter().write(errorMsg);
+            response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
+            return;
+        }
+
+        requestHelper.accept(request, response);
+    }
+
+    private String toJson(List<String> list) {
+        return "[" + list.stream()
+            .map(item -> "\"" + item.replace("\"", "\\\"") + "\"")
+            .collect(Collectors.joining(",")) + "]";
+    }
+
+    private void sendJson(HttpServletResponse response, String json) throws IOException {
+        response.addHeader("Access-Control-Allow-Origin", "*");
+        response.setContentType("application/json;charset=UTF-8");
+        response.getWriter().write(json);
+    }
+
+    private List<String> getIcons() throws IOException {
+        InputStream in = DummyIcon.class.getResourceAsStream("all.txt");
+        try (BufferedReader br = new BufferedReader(new InputStreamReader(in))) {
+            return br.lines().collect(Collectors.toList());
+        }
+    }
+
+    private void sendIconsSprite(HttpServletRequest request, HttpServletResponse response) throws IOException {
+        if (svgIconsSpriteCache == null) {
+            // NOTE: all icons has the following svg tag attributes: width="8" height="8" viewBox="0 0 8 8"
+            List<String> iconNames = getIcons();
+            StringBuilder sprite = new StringBuilder();
+            sprite.append("<svg xmlns=\"http://www.w3.org/2000/svg\" width=\"8\" height=\"8\" viewBox=\"0 0 8 8\">\n");
+            sprite.append("<defs>\n");
+            sprite.append("  <style><![CDATA[\n");
+            sprite.append("    .sprite { display: none; }\n");
+            sprite.append("    .sprite:target { display: inline; }\n");
+            sprite.append("  ]]></style>\n");
+            sprite.append("</defs>\n");
+            for (String name : iconNames) {
+                try (InputStream in = DummyIcon.class.getResourceAsStream(name + ".svg")) {
+                    DocumentBuilder db = DocumentBuilderFactory.newInstance().newDocumentBuilder();
+                    Document doc = db.parse(in);
+                    Writer out = new StringWriter();
+                    out.write("<g class=\"sprite\" id=\"" + name + "\">");
+
+                    Transformer tf = TransformerFactory.newInstance().newTransformer();
+                    tf.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
+                    tf.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
+                    tf.setOutputProperty(OutputKeys.INDENT, "no");
+                    NodeList svgInnerNodes = doc.getElementsByTagName("svg").item(0).getChildNodes();
+                    for (int index = 0; index < svgInnerNodes.getLength(); index++) {
+                        tf.transform(new DOMSource(svgInnerNodes.item(index)), new StreamResult(out));
+                    }
+
+                    out.write("</g>");
+                    sprite.append(out.toString() + "\n");
+                } catch (ParserConfigurationException | SAXException | TransformerException ex) {
+                    // skip icons which can not be parsed/read
+                    Logger logger = Logger.getLogger("com.plantuml");
+                    logger.log(Level.WARNING, "SVG icon '{0}' could not be parsed. Skip!", name);
+                }
+            }
+            sprite.append("</svg>\n");
+            svgIconsSpriteCache = sprite.toString();
+        }
+        response.addHeader("Access-Control-Allow-Origin", "*");
+        response.setContentType("image/svg+xml;charset=UTF-8");
+        response.getWriter().write(svgIconsSpriteCache);
+    }
+
+    private void sendIcons(HttpServletRequest request, HttpServletResponse response) throws IOException {
+        sendJson(response, toJson(getIcons()));
+    }
+
+    private void sendThemes(HttpServletRequest request, HttpServletResponse response) throws IOException {
+        sendJson(response, toJson(ThemeUtils.getAllThemeNames()));
+    }
+}
--- a/src/main/webapp/WEB-INF/web.xml
+++ b/src/main/webapp/WEB-INF/web.xml
@ -1,237 +1,246 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<web-app
-  xmlns="https://jakarta.ee/xml/ns/jakartaee"
-  xmlns:xsi="https://www.w3.org/2001/XMLSchema-instance"
-  xmlns:web="https://jakarta.ee/xml/ns/jakartaee/web-app_5_0.xsd"
-  xsi:schemaLocation="https://jakarta.ee/xml/ns/jakartaee https://jakarta.ee/xml/ns/jakartaee/web-app_5_0.xsd"
-  version="5.0"
->
-
-  <!-- ========================================================== -->
-  <!-- General -->
-  <!-- ========================================================== -->
-
-  <!-- Name the application -->
-  <display-name>PlantUML</display-name>
-  <description>PlantUML Online Server</description>
-
-  <!-- This app is cluster-ready -->
-  <distributable />
-
-  <!-- Set timeout to 120 minutes -->
-  <session-config>
-    <session-timeout>120</session-timeout>
-  </session-config>
-
-
-  <!-- ========================================================== -->
-  <!-- Custom Tag Libraries -->
-  <!-- ========================================================== -->
-
-  <!-- Taglib declarations are no longer required since JSP 2.0, see Removing taglib from web.xml -->
-  <!-- The <taglib> did not need to be a child of <jsp-config> in earlier versions but is required as of Tomcat 7 -->
-  <!-- Note that you can only have one <jsp-config> element per web.xml -->
-  <!--
-  <jsp-config>
-    <taglib>
-      <taglib-uri>http://java.sun.com/jsp/jstl/core</taglib-uri>
-      <taglib-location>/WEB-INF/lib/c.tld</taglib-location>
-    </taglib>
-  </jsp-config>
-  -->
-
-
-  <!-- ========================================================== -->
-  <!-- Context Parameters -->
-  <!-- ========================================================== -->
-
-  <context-param>
-    <param-name>org.eclipse.jetty.servlet.Default.welcomeServlets</param-name>
-    <param-value>exact</param-value>
-  </context-param>
-
-
-  <!-- ========================================================== -->
-  <!-- Servlets -->
-  <!-- ========================================================== -->
-
-  <servlet>
-    <servlet-name>jsp</servlet-name>
-    <servlet-class>org.eclipse.jetty.jsp.JettyJspServlet</servlet-class>
-    <init-param>
-      <param-name>compilerSourceVM</param-name>
-      <param-value>1.7</param-value>
-    </init-param>
-    <init-param>
-      <param-name>compilerTargetVM</param-name>
-      <param-value>1.7</param-value>
-    </init-param>
-  </servlet>
-
-  <servlet>
-    <servlet-name>plantumlservlet</servlet-name>
-    <servlet-class>net.sourceforge.plantuml.servlet.PlantUmlServlet</servlet-class>
-  </servlet>
-  <servlet-mapping>
-    <servlet-name>plantumlservlet</servlet-name>
-    <url-pattern>/welcome</url-pattern>
-  </servlet-mapping>
-  <servlet-mapping>
-    <servlet-name>plantumlservlet</servlet-name>
-    <url-pattern>/uml/*</url-pattern>
-  </servlet-mapping>
-  <servlet-mapping>
-    <servlet-name>plantumlservlet</servlet-name>
-    <url-pattern>/form</url-pattern>
-  </servlet-mapping>
-  <servlet-mapping>
-    <servlet-name>plantumlservlet</servlet-name>
-    <url-pattern>/start/*</url-pattern>
-  </servlet-mapping>
-
-  <servlet>
-    <servlet-name>imgservlet</servlet-name>
-    <servlet-class>net.sourceforge.plantuml.servlet.ImgServlet</servlet-class>
-  </servlet>
-  <servlet-mapping>
-    <servlet-name>imgservlet</servlet-name>
-    <url-pattern>/png/*</url-pattern>
-  </servlet-mapping>
-  <servlet-mapping>
-    <servlet-name>imgservlet</servlet-name>
-    <url-pattern>/img/*</url-pattern>
-  </servlet-mapping>
-
-  <servlet>
-    <servlet-name>svgservlet</servlet-name>
-    <servlet-class>net.sourceforge.plantuml.servlet.SvgServlet</servlet-class>
-  </servlet>
-  <servlet-mapping>
-    <servlet-name>svgservlet</servlet-name>
-    <url-pattern>/svg/*</url-pattern>
-  </servlet-mapping>
-
-  <servlet>
-    <servlet-name>pdfservlet</servlet-name>
-    <servlet-class>net.sourceforge.plantuml.servlet.PdfServlet</servlet-class>
-  </servlet>
-  <servlet-mapping>
-    <servlet-name>pdfservlet</servlet-name>
-    <url-pattern>/pdf/*</url-pattern>
-  </servlet-mapping>
-
-  <servlet>
-    <servlet-name>epsservlet</servlet-name>
-    <servlet-class>net.sourceforge.plantuml.servlet.EpsServlet</servlet-class>
-  </servlet>
-  <servlet-mapping>
-    <servlet-name>epsservlet</servlet-name>
-    <url-pattern>/eps/*</url-pattern>
-  </servlet-mapping>
-
-  <servlet>
-    <servlet-name>epstextservlet</servlet-name>
-    <servlet-class>net.sourceforge.plantuml.servlet.EpsTextServlet</servlet-class>
-  </servlet>
-  <servlet-mapping>
-    <servlet-name>epstextservlet</servlet-name>
-    <url-pattern>/epstext/*</url-pattern>
-  </servlet-mapping>
-
-  <servlet>
-    <servlet-name>base64servlet</servlet-name>
-    <servlet-class>net.sourceforge.plantuml.servlet.Base64Servlet</servlet-class>
-  </servlet>
-  <servlet-mapping>
-    <servlet-name>base64servlet</servlet-name>
-    <url-pattern>/base64/*</url-pattern>
-  </servlet-mapping>
-
-  <servlet>
-    <servlet-name>asciiservlet</servlet-name>
-    <servlet-class>net.sourceforge.plantuml.servlet.AsciiServlet</servlet-class>
-  </servlet>
-  <servlet-mapping>
-    <servlet-name>asciiservlet</servlet-name>
-    <url-pattern>/txt/*</url-pattern>
-  </servlet-mapping>
-
-  <servlet>
-    <servlet-name>proxyservlet</servlet-name>
-    <servlet-class>net.sourceforge.plantuml.servlet.ProxyServlet</servlet-class>
-  </servlet>
-  <servlet-mapping>
-    <servlet-name>proxyservlet</servlet-name>
-    <url-pattern>/proxy</url-pattern>
-  </servlet-mapping>
-
-  <servlet>
-    <servlet-name>oldproxyservlet</servlet-name>
-    <servlet-class>net.sourceforge.plantuml.servlet.OldProxyServlet</servlet-class>
-  </servlet>
-  <servlet-mapping>
-    <servlet-name>oldproxyservlet</servlet-name>
-    <url-pattern>/proxy/*</url-pattern>
-  </servlet-mapping>
-
-  <servlet>
-    <servlet-name>mapservlet</servlet-name>
-    <servlet-class>net.sourceforge.plantuml.servlet.MapServlet</servlet-class>
-  </servlet>
-  <servlet-mapping>
-    <servlet-name>mapservlet</servlet-name>
-    <url-pattern>/map/*</url-pattern>
-  </servlet-mapping>
-
-  <servlet>
-    <servlet-name>checkservlet</servlet-name>
-    <servlet-class>net.sourceforge.plantuml.servlet.CheckSyntaxServlet</servlet-class>
-  </servlet>
-  <servlet-mapping>
-    <servlet-name>checkservlet</servlet-name>
-    <url-pattern>/check/*</url-pattern>
-  </servlet-mapping>
-
-  <servlet>
-    <servlet-name>languageservlet</servlet-name>
-    <servlet-class>net.sourceforge.plantuml.servlet.LanguageServlet</servlet-class>
-  </servlet>
-  <servlet-mapping>
-    <servlet-name>languageservlet</servlet-name>
-    <url-pattern>/language</url-pattern>
-  </servlet-mapping>
-
-  <servlet>
-    <servlet-name>asciicoder</servlet-name>
-    <servlet-class>net.sourceforge.plantuml.servlet.AsciiCoderServlet</servlet-class>
-  </servlet>
-  <servlet-mapping>
-    <servlet-name>asciicoder</servlet-name>
-    <url-pattern>/coder/*</url-pattern>
-  </servlet-mapping>
-
-
-  <!-- ========================================================== -->
-  <!-- Error Handler -->
-  <!-- ========================================================== -->
-
-  <error-page>
-    <exception-type>java.lang.Throwable</exception-type>
-    <location>/error.jsp</location>
-  </error-page>
-
-  <error-page>
-    <error-code>500</error-code>
-    <location>/error.jsp</location>
-  </error-page>
-
-
-  <!-- ========================================================== -->
-  <!-- Welcome Files -->
-  <!-- ========================================================== -->
-
-  <welcome-file-list>
-    <welcome-file>welcome</welcome-file>
-  </welcome-file-list>
-
-</web-app>
+<?xml version="1.0" encoding="UTF-8"?>
+<web-app
+  xmlns="https://jakarta.ee/xml/ns/jakartaee"
+  xmlns:xsi="https://www.w3.org/2001/XMLSchema-instance"
+  xmlns:web="https://jakarta.ee/xml/ns/jakartaee/web-app_5_0.xsd"
+  xsi:schemaLocation="https://jakarta.ee/xml/ns/jakartaee https://jakarta.ee/xml/ns/jakartaee/web-app_5_0.xsd"
+  version="5.0"
+>
+
+  <!-- ========================================================== -->
+  <!-- General -->
+  <!-- ========================================================== -->
+
+  <!-- Name the application -->
+  <display-name>PlantUML</display-name>
+  <description>PlantUML Online Server</description>
+
+  <!-- This app is cluster-ready -->
+  <distributable />
+
+  <!-- Set timeout to 120 minutes -->
+  <session-config>
+    <session-timeout>120</session-timeout>
+  </session-config>
+
+
+  <!-- ========================================================== -->
+  <!-- Custom Tag Libraries -->
+  <!-- ========================================================== -->
+
+  <!-- Taglib declarations are no longer required since JSP 2.0, see Removing taglib from web.xml -->
+  <!-- The <taglib> did not need to be a child of <jsp-config> in earlier versions but is required as of Tomcat 7 -->
+  <!-- Note that you can only have one <jsp-config> element per web.xml -->
+  <!--
+  <jsp-config>
+    <taglib>
+      <taglib-uri>http://java.sun.com/jsp/jstl/core</taglib-uri>
+      <taglib-location>/WEB-INF/lib/c.tld</taglib-location>
+    </taglib>
+  </jsp-config>
+  -->
+
+
+  <!-- ========================================================== -->
+  <!-- Context Parameters -->
+  <!-- ========================================================== -->
+
+  <context-param>
+    <param-name>org.eclipse.jetty.servlet.Default.welcomeServlets</param-name>
+    <param-value>exact</param-value>
+  </context-param>
+
+
+  <!-- ========================================================== -->
+  <!-- Servlets -->
+  <!-- ========================================================== -->
+
+  <servlet>
+    <servlet-name>jsp</servlet-name>
+    <servlet-class>org.eclipse.jetty.jsp.JettyJspServlet</servlet-class>
+    <init-param>
+      <param-name>compilerSourceVM</param-name>
+      <param-value>1.8</param-value>
+    </init-param>
+    <init-param>
+      <param-name>compilerTargetVM</param-name>
+      <param-value>1.8</param-value>
+    </init-param>
+  </servlet>
+
+  <servlet>
+    <servlet-name>plantumlservlet</servlet-name>
+    <servlet-class>net.sourceforge.plantuml.servlet.PlantUmlServlet</servlet-class>
+  </servlet>
+  <servlet-mapping>
+    <servlet-name>plantumlservlet</servlet-name>
+    <url-pattern>/welcome</url-pattern>
+  </servlet-mapping>
+  <servlet-mapping>
+    <servlet-name>plantumlservlet</servlet-name>
+    <url-pattern>/uml/*</url-pattern>
+  </servlet-mapping>
+  <servlet-mapping>
+    <servlet-name>plantumlservlet</servlet-name>
+    <url-pattern>/form</url-pattern>
+  </servlet-mapping>
+  <servlet-mapping>
+    <servlet-name>plantumlservlet</servlet-name>
+    <url-pattern>/start/*</url-pattern>
+  </servlet-mapping>
+
+  <servlet>
+    <servlet-name>imgservlet</servlet-name>
+    <servlet-class>net.sourceforge.plantuml.servlet.ImgServlet</servlet-class>
+  </servlet>
+  <servlet-mapping>
+    <servlet-name>imgservlet</servlet-name>
+    <url-pattern>/png/*</url-pattern>
+  </servlet-mapping>
+  <servlet-mapping>
+    <servlet-name>imgservlet</servlet-name>
+    <url-pattern>/img/*</url-pattern>
+  </servlet-mapping>
+
+  <servlet>
+    <servlet-name>svgservlet</servlet-name>
+    <servlet-class>net.sourceforge.plantuml.servlet.SvgServlet</servlet-class>
+  </servlet>
+  <servlet-mapping>
+    <servlet-name>svgservlet</servlet-name>
+    <url-pattern>/svg/*</url-pattern>
+  </servlet-mapping>
+
+  <servlet>
+    <servlet-name>pdfservlet</servlet-name>
+    <servlet-class>net.sourceforge.plantuml.servlet.PdfServlet</servlet-class>
+  </servlet>
+  <servlet-mapping>
+    <servlet-name>pdfservlet</servlet-name>
+    <url-pattern>/pdf/*</url-pattern>
+  </servlet-mapping>
+
+  <servlet>
+    <servlet-name>epsservlet</servlet-name>
+    <servlet-class>net.sourceforge.plantuml.servlet.EpsServlet</servlet-class>
+  </servlet>
+  <servlet-mapping>
+    <servlet-name>epsservlet</servlet-name>
+    <url-pattern>/eps/*</url-pattern>
+  </servlet-mapping>
+
+  <servlet>
+    <servlet-name>epstextservlet</servlet-name>
+    <servlet-class>net.sourceforge.plantuml.servlet.EpsTextServlet</servlet-class>
+  </servlet>
+  <servlet-mapping>
+    <servlet-name>epstextservlet</servlet-name>
+    <url-pattern>/epstext/*</url-pattern>
+  </servlet-mapping>
+
+  <servlet>
+    <servlet-name>base64servlet</servlet-name>
+    <servlet-class>net.sourceforge.plantuml.servlet.Base64Servlet</servlet-class>
+  </servlet>
+  <servlet-mapping>
+    <servlet-name>base64servlet</servlet-name>
+    <url-pattern>/base64/*</url-pattern>
+  </servlet-mapping>
+
+  <servlet>
+    <servlet-name>asciiservlet</servlet-name>
+    <servlet-class>net.sourceforge.plantuml.servlet.AsciiServlet</servlet-class>
+  </servlet>
+  <servlet-mapping>
+    <servlet-name>asciiservlet</servlet-name>
+    <url-pattern>/txt/*</url-pattern>
+  </servlet-mapping>
+
+  <servlet>
+    <servlet-name>proxyservlet</servlet-name>
+    <servlet-class>net.sourceforge.plantuml.servlet.ProxyServlet</servlet-class>
+  </servlet>
+  <servlet-mapping>
+    <servlet-name>proxyservlet</servlet-name>
+    <url-pattern>/proxy</url-pattern>
+  </servlet-mapping>
+
+  <servlet>
+    <servlet-name>oldproxyservlet</servlet-name>
+    <servlet-class>net.sourceforge.plantuml.servlet.OldProxyServlet</servlet-class>
+  </servlet>
+  <servlet-mapping>
+    <servlet-name>oldproxyservlet</servlet-name>
+    <url-pattern>/proxy/*</url-pattern>
+  </servlet-mapping>
+
+  <servlet>
+    <servlet-name>mapservlet</servlet-name>
+    <servlet-class>net.sourceforge.plantuml.servlet.MapServlet</servlet-class>
+  </servlet>
+  <servlet-mapping>
+    <servlet-name>mapservlet</servlet-name>
+    <url-pattern>/map/*</url-pattern>
+  </servlet-mapping>
+
+  <servlet>
+    <servlet-name>checkservlet</servlet-name>
+    <servlet-class>net.sourceforge.plantuml.servlet.CheckSyntaxServlet</servlet-class>
+  </servlet>
+  <servlet-mapping>
+    <servlet-name>checkservlet</servlet-name>
+    <url-pattern>/check/*</url-pattern>
+  </servlet-mapping>
+
+  <servlet>
+    <servlet-name>languageservlet</servlet-name>
+    <servlet-class>net.sourceforge.plantuml.servlet.LanguageServlet</servlet-class>
+  </servlet>
+  <servlet-mapping>
+    <servlet-name>languageservlet</servlet-name>
+    <url-pattern>/language</url-pattern>
+  </servlet-mapping>
+
+  <servlet>
+    <servlet-name>asciicoderservlet</servlet-name>
+    <servlet-class>net.sourceforge.plantuml.servlet.AsciiCoderServlet</servlet-class>
+  </servlet>
+  <servlet-mapping>
+    <servlet-name>asciicoderservlet</servlet-name>
+    <url-pattern>/coder/*</url-pattern>
+  </servlet-mapping>
+
+  <servlet>
+    <servlet-name>plantumluihelperservlet</servlet-name>
+    <servlet-class>net.sourceforge.plantuml.servlet.PlantUmlUIHelperServlet</servlet-class>
+  </servlet>
+  <servlet-mapping>
+    <servlet-name>plantumluihelperservlet</servlet-name>
+    <url-pattern>/ui-helper/*</url-pattern>
+  </servlet-mapping>
+
+
+  <!-- ========================================================== -->
+  <!-- Error Handler -->
+  <!-- ========================================================== -->
+
+  <error-page>
+    <exception-type>java.lang.Throwable</exception-type>
+    <location>/error.jsp</location>
+  </error-page>
+
+  <error-page>
+    <error-code>500</error-code>
+    <location>/error.jsp</location>
+  </error-page>
+
+
+  <!-- ========================================================== -->
+  <!-- Welcome Files -->
+  <!-- ========================================================== -->
+
+  <welcome-file-list>
+    <welcome-file>welcome</welcome-file>
+  </welcome-file-list>
+
+</web-app>
--- a/src/main/webapp/assets/copy.svg
+++ b/src/main/webapp/assets/copy.svg
@ -0,0 +1 @@
+<svg height="24" width="24" xmlns="http://www.w3.org/2000/svg"><path d="M16 16v4c0 1.152-.848 2-2 2H4c-1.152 0-2-.848-2-2V10c0-1.152.848-2 2-2h4V4c0-1.152.848-2 2-2h10c1.152 0 2 .848 2 2v10c0 1.152-.848 2-2 2h-4zm-2 0h-4c-1.152 0-2-.848-2-2v-4H4v10h10v-4zM10 4v10h10V4H10z" fill-rule="evenodd"/></svg>
--- a/src/main/webapp/assets/dock.svg
+++ b/src/main/webapp/assets/dock.svg
@ -0,0 +1 @@
+<svg height="512" width="512" xmlns="http://www.w3.org/2000/svg"><path d="M384 224v184a40 40 0 01-40 40H104a40 40 0 01-40-40V168a40 40 0 0140-40h167.48" fill="none" stroke="#000" stroke-linecap="round" stroke-linejoin="round" stroke-width="32"/><path fill="none" stroke="#000" stroke-linecap="round" stroke-linejoin="round" stroke-width="32" d="M216 184v112h112m-104-8L440 72"/></svg>
--- a/src/main/webapp/assets/file-types/ascii.svg
+++ b/src/main/webapp/assets/file-types/ascii.svg
@ -0,0 +1 @@
+<svg class="bi bi-filetype-ascii" fill="currentColor" height="16" width="16" xmlns="http://www.w3.org/2000/svg"><path d="M14 4.5V11h-1V4.5h-2A1.5 1.5 0 019.5 3V1H4a1 1 0 00-1 1v9H2V2a2 2 0 012-2h5.5zM2.404 14.903l-.313 1.028h-.8l1.342-3.999h.926l1.335 4h-.84l-.314-1.03H2.404zm1.178-.59l-.49-1.616h-.034l-.49 1.617h1.014zm1.782.977a1.178 1.178 0 01-.111-.449h.764a.58.58 0 00.255.384c.07.049.154.087.25.114.095.028.2.041.319.041.164 0 .3-.023.413-.07a.558.558 0 00.255-.193.507.507 0 00.085-.29.387.387 0 00-.153-.326c-.101-.08-.256-.144-.463-.193l-.618-.143a1.72 1.72 0 01-.54-.214 1.002 1.002 0 01-.35-.367 1.068 1.068 0 01-.123-.524c0-.244.063-.457.19-.639.127-.181.303-.322.527-.422.225-.1.484-.149.777-.149.304 0 .564.05.779.152.217.102.384.239.5.41.12.17.186.359.2.566h-.75a.56.56 0 00-.12-.258.623.623 0 00-.246-.181.923.923 0 00-.37-.068c-.216 0-.387.05-.512.152a.472.472 0 00-.184.384c0 .121.047.22.143.3a.97.97 0 00.404.175l.62.143c.218.05.407.12.567.211.16.09.285.21.375.358.09.148.135.335.135.56 0 .247-.063.466-.188.656-.133.196-.32.348-.54.439-.233.105-.52.158-.857.158a2.191 2.191 0 01-.665-.09 1.404 1.404 0 01-.478-.252 1.131 1.131 0 01-.29-.375zm4.383-2.246a1.732 1.732 0 00-.103.633v.495c0 .246.035.455.103.627a.834.834 0 00.299.393c.142.09.308.136.477.13a.872.872 0 00.402-.087.699.699 0 00.272-.248.8.8 0 00.117-.364h.765v.076c-.01.241-.088.475-.226.674-.136.194-.32.345-.55.454a1.81 1.81 0 01-.785.164c-.36 0-.665-.072-.915-.216a1.424 1.424 0 01-.57-.627c-.13-.272-.194-.597-.194-.976v-.498c0-.38.065-.705.196-.978.13-.274.32-.485.57-.633.253-.15.557-.223.913-.223.218 0 .42.032.606.097.187.062.35.153.49.272.283.241.452.591.465.964v.073h-.765a.85.85 0 00-.12-.38.7.7 0 00-.272-.261.802.802 0 00-.4-.097.814.814 0 00-.473.138.868.868 0 00-.302.398zm3.628-1.106v4h-.79v-4h.79zm1.337.005v3.999h-.791v-4h.79z" fill-rule="evenodd"/></svg>
--- a/src/main/webapp/assets/file-types/map.svg
+++ b/src/main/webapp/assets/file-types/map.svg
@ -0,0 +1 @@
+<svg class="bi bi-filetype-map" fill="currentColor" height="16" width="16" xmlns="http://www.w3.org/2000/svg"><path d="M14 4.5V14a2 2 0 01-2 2v-1a1 1 0 001-1V4.5h-2A1.5 1.5 0 019.5 3V1H4a1 1 0 00-1 1v9H2V2a2 2 0 012-2h5.5zM.706 15.849v-2.66h.038l.952 2.16h.516l.946-2.16h.038v2.66h.715V11.85h-.8l-1.14 2.596h-.026L.805 11.85H0v3.999zm7.31-3.999h1.6c.289 0 .533.06.732.179.201.117.355.276.46.477.106.201.158.427.158.677 0 .25-.053.476-.16.677-.106.199-.26.357-.464.474a1.46 1.46 0 01-.732.173h-.803v1.342h-.79V11.85zm2.06 1.714a.795.795 0 00.085-.381c0-.226-.062-.4-.185-.521-.123-.122-.294-.182-.513-.182h-.659v1.406h.66a.794.794 0 00.374-.082.574.574 0 00.238-.24zm-5.12 2.306l.313-1.028h1.336l.314 1.028h.84l-1.336-3.999h-.925l-1.329 3.96m1.79-3.195l.488 1.617H5.433l.49-1.617z" fill-rule="evenodd"/></svg>
--- a/src/main/webapp/assets/file-types/pdf.svg
+++ b/src/main/webapp/assets/file-types/pdf.svg
@ -0,0 +1 @@
+<svg class="bi bi-filetype-pdf" fill="currentColor" height="16" width="16" xmlns="http://www.w3.org/2000/svg"><path d="M14 4.5V14a2 2 0 01-2 2h-1v-1h1a1 1 0 001-1V4.5h-2A1.5 1.5 0 019.5 3V1H4a1 1 0 00-1 1v9H2V2a2 2 0 012-2h5.5L14 4.5zM1.6 11.85H0v3.999h.791v-1.342h.803c.287 0 .531-.057.732-.173.203-.117.358-.275.463-.474a1.42 1.42 0 00.161-.677c0-.25-.053-.476-.158-.677a1.176 1.176 0 00-.46-.477c-.2-.12-.443-.179-.732-.179zm.545 1.333a.795.795 0 01-.085.38.574.574 0 01-.238.241.794.794 0 01-.375.082H.788V12.48h.66c.218 0 .389.06.512.181.123.122.185.296.185.522zm1.217-1.333v3.999h1.46c.401 0 .734-.08.998-.237a1.45 1.45 0 00.595-.689c.13-.3.196-.662.196-1.084 0-.42-.065-.778-.196-1.075a1.426 1.426 0 00-.589-.68c-.264-.156-.599-.234-1.005-.234H3.362zm.791.645h.563c.248 0 .45.05.609.152a.89.89 0 01.354.454c.079.201.118.452.118.753a2.3 2.3 0 01-.068.592 1.14 1.14 0 01-.196.422.8.8 0 01-.334.252 1.298 1.298 0 01-.483.082h-.563v-2.707zm3.743 1.763v1.591h-.79V11.85h2.548v.653H7.896v1.117h1.606v.638H7.896z" fill-rule="evenodd"/></svg>
--- a/src/main/webapp/assets/file-types/png.svg
+++ b/src/main/webapp/assets/file-types/png.svg
@ -0,0 +1 @@
+<svg class="bi bi-filetype-png" fill="currentColor" height="16" width="16" xmlns="http://www.w3.org/2000/svg"><path d="M14 4.5V14a2 2 0 01-2 2v-1a1 1 0 001-1V4.5h-2A1.5 1.5 0 019.5 3V1H4a1 1 0 00-1 1v9H2V2a2 2 0 012-2h5.5L14 4.5zm-3.76 8.132c.076.153.123.317.14.492h-.776a.797.797 0 00-.097-.249.689.689 0 00-.17-.19.707.707 0 00-.237-.126.96.96 0 00-.299-.044c-.285 0-.506.1-.665.302-.156.201-.234.484-.234.85v.498c0 .234.032.439.097.615a.881.881 0 00.304.413.87.87 0 00.519.146.967.967 0 00.457-.096.67.67 0 00.272-.264c.06-.11.091-.23.091-.363v-.255H8.82v-.59h1.576v.798c0 .193-.032.377-.097.55a1.29 1.29 0 01-.293.458 1.37 1.37 0 01-.495.313c-.197.074-.43.111-.697.111a1.98 1.98 0 01-.753-.132 1.447 1.447 0 01-.533-.377 1.58 1.58 0 01-.32-.58 2.482 2.482 0 01-.105-.745v-.506c0-.362.067-.678.2-.95.134-.271.328-.482.582-.633.256-.152.565-.228.926-.228.238 0 .45.033.636.1.187.066.348.158.48.275.133.117.238.253.314.407zm-8.64-.706H0v4h.791v-1.343h.803c.287 0 .531-.057.732-.172.203-.118.358-.276.463-.475a1.42 1.42 0 00.161-.677c0-.25-.053-.475-.158-.677a1.176 1.176 0 00-.46-.477c-.2-.12-.443-.179-.732-.179zm.545 1.333a.795.795 0 01-.085.381.574.574 0 01-.238.24.794.794 0 01-.375.082H.788v-1.406h.66c.218 0 .389.06.512.182.123.12.185.295.185.521zm1.964 2.666V13.25h.032l1.761 2.675h.656v-3.999h-.75v2.66h-.032l-1.752-2.66h-.662v4h.747z" fill-rule="evenodd"/></svg>
--- a/src/main/webapp/assets/file-types/svg.svg
+++ b/src/main/webapp/assets/file-types/svg.svg
@ -0,0 +1 @@
+<svg class="bi bi-filetype-svg" fill="currentColor" height="16" width="16" xmlns="http://www.w3.org/2000/svg"><path d="M14 4.5V14a2 2 0 01-2 2v-1a1 1 0 001-1V4.5h-2A1.5 1.5 0 019.5 3V1H4a1 1 0 00-1 1v9H2V2a2 2 0 012-2h5.5L14 4.5zM0 14.841a1.13 1.13 0 00.401.823c.13.108.288.192.478.252.19.061.411.091.665.091.338 0 .624-.053.858-.158.237-.105.416-.252.54-.44a1.17 1.17 0 00.187-.656c0-.224-.045-.41-.135-.56a1 1 0 00-.375-.357 2.027 2.027 0 00-.565-.21l-.621-.144a.97.97 0 01-.405-.176.37.37 0 01-.143-.299c0-.156.061-.284.184-.384.125-.101.296-.152.513-.152.143 0 .266.023.37.068a.625.625 0 01.245.181.56.56 0 01.12.258h.75a1.092 1.092 0 00-.199-.566 1.21 1.21 0 00-.5-.41 1.813 1.813 0 00-.78-.152c-.293 0-.552.05-.776.15-.225.099-.4.24-.528.421-.127.182-.19.395-.19.639 0 .201.04.376.123.524.082.149.199.27.351.367.153.095.332.167.54.213l.618.144c.207.049.36.113.462.193a.387.387 0 01.153.326.512.512 0 01-.085.29.559.559 0 01-.256.193c-.111.047-.249.07-.413.07-.117 0-.224-.013-.32-.04a.837.837 0 01-.248-.115.578.578 0 01-.255-.384H0zm4.575 1.09h.952l1.327-3.999h-.879l-.887 3.138H5.05l-.897-3.138h-.917l1.339 4zm5.483-3.293c.076.152.123.316.14.492h-.776a.797.797 0 00-.096-.249.689.689 0 00-.17-.19.707.707 0 00-.237-.126.963.963 0 00-.3-.044c-.284 0-.506.1-.664.302-.157.2-.235.484-.235.85v.497c0 .235.033.44.097.616a.881.881 0 00.305.413.87.87 0 00.518.146.965.965 0 00.457-.097.67.67 0 00.273-.263c.06-.11.09-.23.09-.364v-.254h-.823v-.59h1.576v.798c0 .193-.032.377-.096.55a1.29 1.29 0 01-.293.457 1.37 1.37 0 01-.495.314c-.198.074-.43.111-.698.111a1.98 1.98 0 01-.752-.132 1.447 1.447 0 01-.534-.377 1.58 1.58 0 01-.319-.58 2.482 2.482 0 01-.105-.745v-.507c0-.36.066-.677.199-.949.134-.271.329-.482.583-.633.256-.152.564-.228.926-.228.238 0 .45.033.635.1.188.066.348.158.48.275.134.117.238.253.314.407z" fill-rule="evenodd"/></svg>
--- a/src/main/webapp/assets/file-types/txt.svg
+++ b/src/main/webapp/assets/file-types/txt.svg
@ -0,0 +1 @@
+<svg class="bi bi-filetype-txt" fill="currentColor" height="16" width="16" xmlns="http://www.w3.org/2000/svg"><path d="M14 4.5V14a2 2 0 01-2 2h-2v-1h2a1 1 0 001-1V4.5h-2A1.5 1.5 0 019.5 3V1H4a1 1 0 00-1 1v9H2V2a2 2 0 012-2h5.5L14 4.5zM1.928 15.849v-3.337h1.136v-.662H0v.662h1.134v3.337h.794zm4.689-3.999h-.894L4.9 13.289h-.035l-.832-1.439h-.932l1.228 1.983-1.24 2.016h.862l.853-1.415h.035l.85 1.415h.907l-1.253-1.992 1.274-2.007zm1.93.662v3.337h-.794v-3.337H6.619v-.662h3.064v.662H8.546z" fill-rule="evenodd"/></svg>
--- a/src/main/webapp/assets/github-fork-me.png
+++ b/src/main/webapp/assets/github-fork-me.png
--- a/src/main/webapp/assets/settings.svg
+++ b/src/main/webapp/assets/settings.svg
@ -0,0 +1 @@
+<svg height="512" width="512" xmlns="http://www.w3.org/2000/svg"><path d="M262.29 192.31a64 64 0 1057.4 57.4 64.13 64.13 0 00-57.4-57.4zM416.39 256a154.34 154.34 0 01-1.53 20.79l45.21 35.46a10.81 10.81 0 012.45 13.75l-42.77 74a10.81 10.81 0 01-13.14 4.59l-44.9-18.08a16.11 16.11 0 00-15.17 1.75A164.48 164.48 0 01325 400.8a15.94 15.94 0 00-8.82 12.14l-6.73 47.89a11.08 11.08 0 01-10.68 9.17h-85.54a11.11 11.11 0 01-10.69-8.87l-6.72-47.82a16.07 16.07 0 00-9-12.22 155.3 155.3 0 01-21.46-12.57 16 16 0 00-15.11-1.71l-44.89 18.07a10.81 10.81 0 01-13.14-4.58l-42.77-74a10.8 10.8 0 012.45-13.75l38.21-30a16.05 16.05 0 006-14.08c-.36-4.17-.58-8.33-.58-12.5s.21-8.27.58-12.35a16 16 0 00-6.07-13.94l-38.19-30A10.81 10.81 0 0149.48 186l42.77-74a10.81 10.81 0 0113.14-4.59l44.9 18.08a16.11 16.11 0 0015.17-1.75A164.48 164.48 0 01187 111.2a15.94 15.94 0 008.82-12.14l6.73-47.89A11.08 11.08 0 01213.23 42h85.54a11.11 11.11 0 0110.69 8.87l6.72 47.82a16.07 16.07 0 009 12.22 155.3 155.3 0 0121.46 12.57 16 16 0 0015.11 1.71l44.89-18.07a10.81 10.81 0 0113.14 4.58l42.77 74a10.8 10.8 0 01-2.45 13.75l-38.21 30a16.05 16.05 0 00-6.05 14.08c.33 4.14.55 8.3.55 12.47z" fill="none" stroke="#000" stroke-linecap="round" stroke-linejoin="round" stroke-width="32"/></svg>
--- a/src/main/webapp/assets/undock.svg
+++ b/src/main/webapp/assets/undock.svg
@ -0,0 +1 @@
+<svg height="512" width="512" xmlns="http://www.w3.org/2000/svg"><path d="M384 224v184a40 40 0 01-40 40H104a40 40 0 01-40-40V168a40 40 0 0140-40h167.48M336 64h112v112M224 288L440 72" fill="none" stroke="#000" stroke-linecap="round" stroke-linejoin="round" stroke-width="32"/></svg>
--- a/src/main/webapp/footer.jspf
+++ b/src/main/webapp/footer.jspf
@ -1,4 +0,0 @@
-<div id="footer">
-    <p>PlantUML Server Version <%= net.sourceforge.plantuml.version.Version.version() %>
-    </p>
-</div>
--- a/src/main/webapp/index.jsp
+++ b/src/main/webapp/index.jsp
@ -1,93 +1,57 @@
 <%@ page info="index" contentType="text/html; charset=utf-8" pageEncoding="utf-8" session="false" %>
-
 <%
-    // diagram sources
-    String decoded = request.getAttribute("decoded").toString();
-    // properties
-    boolean showSocialButtons = (boolean)request.getAttribute("showSocialButtons");
-    boolean showGithubRibbon = (boolean)request.getAttribute("showGithubRibbon");
-    // image URLs
-    boolean hasImg = (boolean)request.getAttribute("hasImg");
-    String imgurl = request.getAttribute("imgurl").toString();
-    String svgurl = request.getAttribute("svgurl").toString();
-    String txturl = request.getAttribute("txturl").toString();
-    String pdfurl = request.getAttribute("pdfurl").toString();
-    String mapurl = request.getAttribute("mapurl").toString();
-    // map for diagram source if necessary
-    boolean hasMap = (boolean)request.getAttribute("hasMap");
-    String map = request.getAttribute("map").toString();
+  // diagram sources
+  String encoded = request.getAttribute("encoded").toString();
+  String decoded = request.getAttribute("decoded").toString();
+  String index = request.getAttribute("index").toString();
+  String diagramUrl = ((index.isEmpty()) ? "" : index + "/") + encoded;
+  // map for diagram source if necessary
+  String map = request.getAttribute("map").toString();
+  boolean hasMap = !map.isEmpty();
+  // properties
+  boolean showSocialButtons = (boolean)request.getAttribute("showSocialButtons");
+  boolean showGithubRibbon = (boolean)request.getAttribute("showGithubRibbon");
 %>

 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
-<html xmlns="http://www.w3.org/1999/xhtml">
+<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
 <head>
-    <base href="<%= request.getContextPath() %>/" />
-    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
-    <meta http-equiv="expires" content="0" />
-    <meta http-equiv="pragma" content="no-cache" />
-    <meta http-equiv="cache-control" content="no-cache, must-revalidate" />
-    <link rel="icon" href="favicon.ico" type="image/x-icon"/> 
-    <link rel="shortcut icon" href="favicon.ico" type="image/x-icon"/>
-    <link rel="stylesheet" href="plantuml.css" />
-    <link rel="stylesheet" href="webjars/codemirror/5.63.0/lib/codemirror.css" />
-    <script src="plantuml.js"></script>
-    <script src="webjars/codemirror/5.63.0/lib/codemirror.js"></script>
-    <title>PlantUMLServer</title>
+  <%@ include file="resource/htmlheadbase.jsp" %>
+  <title>PlantUML Server</title>
 </head>
 <body>
-    <div id="header">
-        <%-- PAGE TITLE --%>
-        <h1>PlantUML Server</h1>
-        <% if (showSocialButtons) { %>
-            <%@ include file="resource/socialbuttons1.html" %>
-        <% } %>
-        <% if (showGithubRibbon) { %>
-            <%@ include file="resource/githubribbon.html" %>
-        <% } %>
-        <p>Create your <a href="https://plantuml.com">PlantUML</a> diagrams directly in your browser!</p>
+  <div class="app flex-rows">
+    <div class="header">
+      <h1>PlantUML Server</h1>
+      <% if (showSocialButtons) { %>
+        <%@ include file="resource/socialbuttons1.html" %>
+      <% } %>
+      <% if (showGithubRibbon) { %>
+        <%@ include file="resource/githubribbon.html" %>
+      <% } %>
+      <p>Create your <a href="https://plantuml.com">PlantUML</a> diagrams directly in your browser!</p>
    </div>
-    <div id="content">
-        <%-- CONTENT --%>
-        <form method="post" accept-charset="utf-8"  action="form">
-            <p> <label for="text">UML Editor Content</label>
-                <textarea id="text" name="text" cols="120" rows="10"><%= net.sourceforge.plantuml.servlet.PlantUmlServlet.stringToHTMLString(decoded) %></textarea>
-                <input type="submit" value="Submit" title="Submit Code and generate diagram"/>&nbsp;
-                <input type="submit" value="Copy Content to Clipboard" title="Copy Content to the clipboard" onclick="copyToClipboard('text','Content');return false; ">
-            </p>
-        </form>
-        <hr/>
-        <p>You can enter here a previously generated URL:</p>
-        <form method="post" action="form">
-            <p> <label for="url">previously generated URL</label>
-                <input id="url" name="url" type="text" size="150" value="<%= imgurl %>" />
-                <br/>
-                <input type="submit" value="Decode URL" title="Decode URL and show code and diagram"/>&nbsp;
-                <input type="submit" value="Copy URL to Clipboard" title="Copy URL to the clipboard" onclick="copyToClipboard('url','URL');return false; ">
-            </p>
-        </form>
-        <% if (hasImg) { %>
-            <hr/>
-            <a href="<%= imgurl %>" title="View diagram as PNG">View as PNG</a>&nbsp;
-            <a href="<%= svgurl %>" title="View diagram as SVG">View as SVG</a>&nbsp;
-            <a href="<%= txturl %>" title="View diagram as ASCII Art">View as ASCII Art</a>&nbsp;
-            <a href="<%= pdfurl %>" title="View diagram as PDF">View as PDF</a>&nbsp;
-            <% if (hasMap) { %>
-                <a href="<%= mapurl %>">View Map Data</a>
-            <% } %>
-            <% if (showSocialButtons) { %>
-                <%@ include file="resource/socialbuttons2.jspf" %>
-            <% } %>
-            <p id="diagram">
-                <% if (!hasMap) { %>
-                    <img src="<%= imgurl %>" alt="PlantUML diagram" />
-                <% } else { %>
-                    <img src="<%= imgurl %>" alt="PlantUML diagram" usemap="#plantuml_map" />
-                    <%= map %>
-                <% } %>
-            </p>
-        <% } %>
+    <div class="main flex-main flex-columns">
+      <div id="editor-main-container" class="editor flex-main flex-rows">
+        <div>
+          <div class="btn-input">
+            <input id="url" type="text" name="url" value="png/<%= diagramUrl %>" />
+            <input type="image" alt="copy" src="assets/copy.svg" onclick="copyUrlToClipboard()" />
+          </div>
+        </div>
+        <div class="flex-main monaco-editor-container">
+          <textarea id="initCode" name="initCode" style="display: none;"><%= net.sourceforge.plantuml.servlet.PlantUmlServlet.stringToHTMLString(decoded) %></textarea>
+          <div id="monaco-editor"></div>
+          <input type="image" alt="copy" src="assets/copy.svg" onclick="copyCodeToClipboard()" />
+        </div>
+      </div>
+      <div id="previewer-main-container" class="previewer flex-main">
+        <%@ include file="resource/preview.jsp" %>
+      </div>
    </div>
-    <%-- FOOTER --%>
-    <%@ include file="footer.jspf" %> 
+    <div class="footer">
+      <%@ include file="resource/footer.jsp" %>
+    </div>
+  </div>
 </body>
-</html>
+</html>
--- a/src/main/webapp/plantuml.css
+++ b/src/main/webapp/plantuml.css
@ -2,67 +2,394 @@
 * PlantUMLServlet style sheet *
 ******************************/

-/* Font */
-h1, p, #content a {
-    font-family: arial,helvetica,sans-serif;
-    /* font-size: medium; */
+/************* variables *************/
+:root {
+  color-scheme: light dark;
+  --border-color: #ccc;
+  --bg-color: inherit;
+  --font-color: inherit;
+  --settings-bg-color: #fefefe;
+}
+[data-theme="dark"] {
+  --border-color: #848484;
+  --bg-color: #212121;
+  --settings-bg-color: #424242;
+  --font-color: #ccc;
 }

-/* Header */
-#header {
-    margin-left: auto;
-    margin-right: auto;    
-    text-align: center;
+/************* default settings *************/
+html, body {
+  margin: 0;
+  padding: 0;
+}
+html {
+  font-family: arial,helvetica,sans-serif;
+}
+body {
+  background-color: var(--bg-color);
+  color: var(--font-color);
+  overflow: auto;
+}
+@media screen and (min-width: 900px) {
+  body {
+    height: 100vh;
+    overflow: hidden;
+  }
+  .app {
+    height: 100%;
+  }
 }

-/* Content */
-#content {
-    margin-left: auto;
-    margin-right: auto;
-    width: 95%;    
+/************* ruler *************/
+.hr {
+  padding: 1rem 0;
+  width: 100%;
+}
+.flex-columns > .hr {
+  padding: 0 1rem;
+  width: initial;
+  height: 100%;
+}
+.hr:after {
+  content: "";
+  display: block;
+  background-color: var(--border-color);
+  height: 100%;
+  width: 100%;
+  min-height: 3px;
+  min-width: 3px;
 }

-/* Form inputs */
-#content textarea, #content .CodeMirror, #content input[type=text] {
-    background-color: #ffffff;
-    font-family: monospace;
-    font-size: medium;
-    width: 100%;
-    resize: vertical;
-    border: 3px solid #ccc !important;
+/************* flex rows and columns *************/
+.flex-columns {
+  display: flex;
+  flex-direction: row;
+  flex-wrap: wrap;
+}
+.flex-rows {
+  display: flex;
+  flex-direction: column;
+}
+.flex-main {
+  flex: 1 1 1px;
+  overflow: auto;
+}
+.flex-columns > *, .flex-rows > * {
+  flex-shrink: 0;
 }

-#content input[type=text] {
-    border: 0;
+/*******************************************************************/
+/************* header, main, footer *************/
+.header {
+  margin-left: auto;
+  margin-right: auto;
+  text-align: center;
+}
+.main {
+  margin: 1% 5%;
+  z-index: 1;
+}
+.main > div {
+  margin: 0 1.75%;
+}
+.main > div:first-child {
+  margin-left: 0;
+}
+.main > div:last-child {
+  margin-right: 0;
+}
+@media screen and (max-width: 900px) {
+  .main {
+    display: block;
+    overflow: inherit;
+  }
+  .main > div {
+    margin: 1.75% 0;
+  }
+  .main > div:first-child {
+    margin-top: 0;
+  }
+  .main > div:last-child {
+    margin-bottom: 0;
+  }
+}
+.footer p {
+  background-color: #eee;
+  color: #666;
+  font-size: 0.7em;
+  margin: 0;
+  padding: 0.5em;
+  text-align: center;
 }

-#content input[type="submit"] {
-    margin-top: 10px;
-    padding: 5px;
-    background: #fafafa;
-    border: 1px solid black;
+/*******************************************************************/
+/************* editor *************/
+.editor {
+  border: 3px solid var(--border-color);
+  box-sizing: border-box;
+  overflow: hidden;
+}
+@media screen and (max-width: 900px) {
+  .editor {
+    height: 20em;
+  }
+}
+.monaco-editor-container {
+  overflow: hidden;
+  position: relative;
+}
+#monaco-editor {
+  height: 100%;
+}
+/* Hack to display the icons in the icon auto completion documentation in a visible size.
+ * (see PlantUmlLanguageFeatures.registerIconCompletion) */
+#monaco-editor .overlayWidgets .suggest-details p img[alt="icon"] {
+  height: 1.2rem;
 }

-#content input[type="submit"]:hover {
-    background: #f0f0f0;
+/************* URL input + copy button *************/
+.btn-input {
+  align-items: center;
+  border-bottom: 3px solid var(--border-color);
+  box-sizing: border-box;
+  display: flex;
+  justify-content: center;
+}
+.btn-input input[type=text] {
+  border: 0;
+  flex: 1 1 1px;
+  font-family: monospace;
+  font-size: medium;
+  padding: 0.2em;
+  text-overflow: ellipsis;
+}
+.btn-input input[type=text]:focus {
+  border: 0;
+  box-shadow: none;
+  outline: none;
+}
+.btn-input input[type=image] {
+  height: 1rem;
+  margin-left: 0.7em;
+  padding: 0 0.3em;
 }

-/* Diagram */
-#content #diagram {
-    text-align: center;
+/************* Monaco editor copy button *************/
+.monaco-editor-container input[type=image] {
+  height: 1.5rem;
+  position: absolute;
+  right: 2rem;
+  top: 1rem;
+  opacity: 0.5;
+}
+.monaco-editor-container input[type=image]:hover {
+  opacity: 1;
 }

-#content #diagram img {
-    border: medium solid green;
-    padding: 10px;
+/*******************************************************************/
+/************* previewer *************/
+.content.viewer-content {
+  margin: 5%;
+}
+.content.viewer-content, .previewer-container {
+  height: 100%;
+}
+@media screen and (max-width: 900px) {
+  .previewer-container {
+    height: initial;
+  }
+  .previewer-main {
+    flex: none;
+  }
 }

-/* Footer */
-#footer p {
-    background-color: #eee;
-    color: #666;
-    font-size: 0.7em;
-    padding: 2px;
-    text-align: center;
-    width: 100%;
-}
+/************* menu *************/
+.preview-menu {
+  margin-left: 5%;
+  margin-right: 5%;
+}
+.diagram-link img, .btn-dock {
+  width: 2.5rem;
+}
+.btn-settings {
+  width: 2.2rem;
+  margin-left: auto;
+  margin-right: 0.25rem;
+}
+.menu-r {
+  min-width: 3rem;
+}
+.menu-r .btn-float-r {
+  float: right;
+  margin-left: 0.25rem;
+  text-align: right;
+}
+.diagram-links {
+  align-items: center;
+  display: flex;
+}
+.diagram-link {
+  margin-left: 0.25rem;
+  margin-right: 0.25rem;
+}
+.diagram-links .diagram-link:first-of-type {
+  margin-left: 0.5rem;
+}
+.diagram-links .diagram-link:last-of-type {
+  margin-right: 0;
+}
+
+/************* paginator *************/
+#paginator {
+  text-align: center;
+  margin-bottom: 1rem;
+}
+
+/************* diagram *************/
+.diagram {
+  height: 100%;
+  overflow: auto;
+}
+.diagram[data-diagram-type="pdf"] {
+  overflow: hidden;
+}
+.diagram > div {
+  margin: 1rem 0;
+  text-align: center;
+}
+.diagram[data-diagram-type="pdf"] > div {
+  height: 20em;
+  width: 100%;
+}
+.diagram img, .diagram svg, .diagram pre {
+  border: 3px solid var(--border-color);
+  box-sizing: border-box;
+  padding: 10px;
+}
+@media screen and (min-width: 900px) {
+  .diagram {
+    position: relative;
+  }
+  .diagram > div {
+    margin: 0;
+  }
+  .diagram:not([data-diagram-type="pdf"]) > div {
+    position: absolute;
+    top: 50%;
+    left: 50%;
+    transform: translate(-50%, -50%);
+    max-height: 100%;
+    max-width: 100%;
+  }
+  .diagram[data-diagram-type="pdf"] > div {
+    height: 100%;
+  }
+}
+
+/*******************************************************************/
+/************* settings *************/
+/************* modal *************/
+.modal {
+  display: block;
+  position: fixed;
+  z-index: 1;
+  padding: 5%;
+  left: 0;
+  top: 0;
+  bottom: 0;
+  right: 0;
+  overflow: auto;
+  background-color: rgb(0, 0, 0);
+  background-color: rgba(0, 0, 0, 0.4);
+}
+.modal-content {
+  background-color: var(--settings-bg-color);
+  margin: auto;
+  padding: 2rem;
+  border: 3px solid var(--border-color);
+  max-width: 30rem;
+  box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
+  -webkit-animation-name: animatetop;
+  -webkit-animation-duration: 0.4s;
+  animation-name: animatetop;
+  animation-duration: 0.4s;
+  position: relative;
+  top: 50%;
+  transform: translateY(-50%);
+}
+@-webkit-keyframes animatetop {
+  from { top: -50%; opacity: 0; }
+  to { top: 50%; opacity: 1; }
+}
+@keyframes animatetop {
+  from { top: -50%; opacity: 0; }
+  to { top: 50%; opacity: 1; }
+}
+/************* header, main, footer *************/
+#settings .settings-header h2 {
+  margin: 0;
+}
+#settings .settings-main {
+  flex: 1;
+}
+#settings .settings-footer {
+  text-align: right;
+}
+/************* label + input *************/
+#settings .setting {
+  margin: 1rem 0;
+  overflow: hidden;
+}
+#settings .setting:first-child {
+  margin: 0;
+}
+#settings .setting label {
+  display: inline-block;
+  min-width: 15rem;
+}
+#settings .setting label + input, #settings .setting label + select {
+  box-sizing: border-box;
+  display: inline-block;
+  min-width: 10rem;
+}
+#settings input, #settings select {
+  border: 1px solid var(--border-color);
+}
+#settings input:not(:focus):invalid {
+  border-bottom-color: red;
+}
+/************* settings editor *************/
+#settings #settings-monaco-editor {
+  height: 17rem;
+  border: 1px solid var(--border-color);
+}
+/************* ok + cancel buttons *************/
+#settings input.ok, #settings input.cancel {
+  min-width: 5rem;
+}
+#settings input.ok:hover {
+  border-bottom-color: green;
+}
+#settings input.cancel:hover {
+  border-bottom-color: darkred;
+}
+
+/*******************************************************************/
+/************* color themes *************/
+[data-theme="dark"] img:not(#diagram-png):not(.no-filter) {
+  filter: invert() contrast(30%);
+}
+[data-theme="dark"] input[type=image] {
+  filter: invert() contrast(30%);
+}
+[data-theme="dark"] input:not([type=image]) {
+  background-color: var(--bg-color);
+  color: var(--font-color);
+}
+[data-theme="dark"] .footer p {
+  background-color: black;
+  color: var(--font-color);
+}
+[data-theme="dark"] a {
+  color: white;
+}
--- a/src/main/webapp/plantuml.js
+++ b/src/main/webapp/plantuml.js
@ -2,57 +2,742 @@
 * PlantUMLServlet script *
 **************************/

-let clipboard_write = false;
-let clipboard_read = false;
+// ==========================================================================================================
+// == global configuration ==

-function copyToClipboard(fieldid, fielddesc) {
-    if (clipboard_write) {
-        navigator.clipboard.writeText(document.getElementById(fieldid).value);
-        alert(fielddesc + " copied to clipboard");
+document.appConfig = Object.assign({}, window.opener?.document.appConfig);
+if (Object.keys(document.appConfig).length === 0) {
+  document.appConfig = JSON.parse(localStorage.getItem("document.appConfig")) || {
+    changeEventsEnabled: true,
+    // `autoRefreshState` is mostly used for unit testing puposes.
+    // states: disabled | waiting | started | syncing | complete
+    autoRefreshState: "disabled",
+    theme: undefined,  // dark | light  (will be set via `initTheme` if undefined)
+    diagramPreviewType: "png",
+    editorWatcherTimeout: 500,
+    editorCreateOptions: {
+      automaticLayout: true,
+      fixedOverflowWidgets: true,
+      minimap: { enabled: false },
+      scrollbar: { alwaysConsumeMouseWheel: false },
+      scrollBeyondLastLine: false,
+      tabSize: 2,
+      theme: "vs",  // "vs-dark"
    }
-    return false;
+  };
 }

-function loadCodeMirror() {
-    document.myCodeMirror = CodeMirror.fromTextArea(
-        document.getElementById("text"), 
-        {
-            lineNumbers: true,
-            extraKeys: {Tab: false, "Shift-Tab": false} 
-        }
-    );
+
+// ==========================================================================================================
+// == DOM helpers ==
+
+function removeChildren(el) {
+  if (el.replaceChildren) {
+    el.replaceChildren();
+  } else {
+    el.innerHTML = "";
+  }
 }

+function isVisible(el) {
+  // `offsetParent` returns `null` if the element, or any of its parents,
+  // is hidden via the display style property.
+  // see: https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/offsetParent
+  return (el.offsetParent === null)
+}
+
+function setVisibility(el, visibility, focus=false) {
+  if (visibility) {
+    el.style.removeProperty("display");
+    if (focus) el.focus();
+  } else {
+    el.style.display = "none";
+  }
+}
+
+
+// ==========================================================================================================
+// == URL helpers ==
+
 function resolvePath(path) {
-    if (path.startsWith("http")) return path;
-    if (path.startsWith("/"))  return window.location.origin + path;
+  // also see `PlantUmlLanguageFeatures.resolvePath(path)`
+  if (path.startsWith("http")) return path;
+  if (path.startsWith("/")) return window.location.origin + path;

-    if (path.slice(0, 2) == "./") path = path.slice(2);
-    let base = (document.querySelector('base') || {}).href || window.location.origin;
-    if (base.slice(-1) == "/") base = base.slice(0, -1);
-    return base + "/" + path;
+  if (path.slice(0, 2) == "./") path = path.slice(2);
+  let base = (document.querySelector("base") || {}).href || window.location.origin;
+  if (base.slice(-1) == "/") base = base.slice(0, -1);
+  return base + "/" + path;
 }

-window.onload = function() {
-    loadCodeMirror();
+function prepareUrl(url) {
+  if (!(url instanceof URL)) {
+    url = new URL(resolvePath(url));
+  }
+  // pathname excluding context path
+  let base = new URL((document.querySelector("base") || {}).href || window.location.origin).pathname;
+  if (base.slice(-1) === "/") base = base.slice(0, -1);
+  const pathname = url.pathname.startsWith(base) ? url.pathname.slice(base.length) : url.pathname;
+  // same as `UrlDataExtractor.URL_PATTERN`
+  const regex = /\/\w+(?:\/(?<idx>\d+))?(?:\/(?<encoded>[^\/]+))?\/?$/gm;
+  const match = regex.exec(pathname);
+  return [ url, pathname, match ];
+}

-    // resolve relative path inside url input once
-    const url = document.getElementById("url");
-    url.value = resolvePath(url.value);
+function analyseUrl(url) {
+  let match;
+  [url, _, match] = prepareUrl(url);
+  return {
+    index: match.groups.idx,
+    encodedDiagram: match.groups.encoded || url.searchParams.get("url"),
+  };
+}

-    // clipboard check (from PR#250)
-    // TODO: not supported by Firefox, Safari or WebView Android
-    // https://developer.mozilla.org/en-US/docs/Web/API/Permissions_API#browser_compatibility
-    if (navigator.permissions){
-        navigator.permissions.query({ name: "clipboard-write" }).then((result) => {
-            if (result.state == "granted" || result.state == "prompt") {
-                clipboard_write = true;
-            }
+function replaceUrl(url, encodedDiagram, index) {
+  let oldPathname, match;
+  [url, oldPathname, match] = prepareUrl(url);
+  let pathname = oldPathname.slice(1);
+  pathname = pathname.slice(0, pathname.indexOf("/"));
+  if (index && index >= 0) pathname += "/" + index;
+  if (match.groups.encoded) pathname += "/" + encodedDiagram;
+  if (oldPathname.slice(-1) === "/") pathname += "/";
+  url.pathname = new URL(resolvePath(pathname)).pathname;
+  if (url.searchParams.get("url")) {
+    url.searchParams.set("url", encodedDiagram);
+  }
+  return { url, pathname };
+}
+
+function buildUrl(serletpath, encodedDiagram, index) {
+  let pathname = serletpath;
+  if (index && index >= 0) pathname += "/" + index;
+  pathname += "/" + encodedDiagram;
+  return pathname;
+}
+
+
+// ==========================================================================================================
+// == clipboard helpers ==
+
+function copyUrlToClipboard() {
+  const input = document.getElementById("url");
+  input.focus();
+  input.select();
+  navigator.clipboard?.writeText(input.value).catch(() => {});
+}
+
+function copyCodeToClipboard() {
+  const range = document.editor.getModel().getFullModelRange();
+  document.editor.focus();
+  document.editor.setSelection(range);
+  const code = document.editor.getValue();
+  navigator.clipboard?.writeText(code).catch(() => {});
+}
+
+
+// ==========================================================================================================
+// == theme helpers ==
+
+function getBrowserThemePreferences() {
+  if (window.matchMedia("(prefers-color-scheme: dark)").matches) {
+    return "dark";
+  }
+  if (window.matchMedia("(prefers-color-scheme: light)").matches) {
+    return "light";
+  }
+  return undefined;
+}
+
+function setTheme(theme) {
+  document.documentElement.setAttribute("data-theme", theme);
+}
+
+
+// ==========================================================================================================
+// == asynchron server calls ==
+
+function call(method, url, data, callback) {
+  const xhr = new XMLHttpRequest();
+  xhr.onreadystatechange = function() {
+    if (xhr.readyState == 4 && xhr.status == 200) {
+      callback(xhr.responseText);
+    }
+  }
+  xhr.open(method, url, true);
+  xhr.setRequestHeader("Content-Type", "text/plain");
+  xhr.send(data);
+}
+
+function decodeDiagram(encodedDiagram, callback) {
+  call("GET", "coder/" + encodedDiagram, null, callback);
+}
+
+function encodeDiagram(diagram, callback) {
+  call("POST", "coder", diagram, callback);
+}
+
+function requestDiagram(type, encodedDiagram, index, callback) {
+  call("GET", buildUrl(type, encodedDiagram, index), null, callback);
+}
+
+function requestDiagramMap(encodedDiagram, index, callback) {
+  requestDiagram("map", encodedDiagram, index, callback);
+}
+
+
+// ==========================================================================================================
+// == settings ==
+
+function initSettings() {
+  document.getElementById("settings").addEventListener("keydown", (event) => {
+    event.preventDefault();
+    console.log(event);
+    if (event.key === "Escape" || event.key === "Esc") {
+      closeSettings();
+    }
+  }, false);
+  document.getElementById("theme").addEventListener("change", (event) => {
+    const theme = event.target.value;
+    const editorCreateOptionsString = document.settingsEditor.getValue();
+    const replaceTheme = (theme === "dark") ? "vs" : "vs-dark";
+    const substituteTheme = (theme === "dark") ? "vs-dark" : "vs";
+    const regex = new RegExp('("theme"\\s*:\\s*)"' + replaceTheme + '"', "gm");
+    document.settingsEditor.getModel().setValue(
+      editorCreateOptionsString.replace(regex, '$1"' + substituteTheme + '"')
+    );
+  });
+  document.settingsEditor = monaco.editor.create(document.getElementById("settings-monaco-editor"), {
+		language: "json", ...document.appConfig.editorCreateOptions
+	});
+}
+
+function openSettings() {
+  setVisibility(document.getElementById("settings"), true, true);
+  if (!document.settingsEditor) {
+    initSettings();
+  }
+  // fill settings form
+  document.getElementById("theme").value = document.appConfig.theme;
+  document.getElementById("diagramPreviewType").value = document.appConfig.diagramPreviewType;
+  document.getElementById("editorWatcherTimeout").value = document.appConfig.editorWatcherTimeout;
+  document.settingsEditor.getModel().setValue(
+    JSON.stringify(document.appConfig.editorCreateOptions, null, "  ")
+  );
+}
+
+function closeSettings() {
+  setVisibility(document.getElementById("settings"), false);
+}
+
+function saveSettings() {
+  const appConfig = Object.assign({}, document.appConfig);
+  appConfig.theme = document.getElementById("theme").value;
+  appConfig.editorWatcherTimeout = document.getElementById("editorWatcherTimeout").value;
+  appConfig.diagramPreviewType = document.getElementById("diagramPreviewType").value;
+  appConfig.editorCreateOptions = JSON.parse(document.settingsEditor.getValue());
+  broadcastSettings(appConfig);
+  closeSettings();
+}
+
+function broadcastSettings(appConfig) {
+  localStorage.setItem("document.appConfig", JSON.stringify(appConfig));
+  sendMessage({
+    sender: "settings",
+    data: { appConfig },
+    synchronize: true,
+  });
+}
+
+function applySettings() {
+  setTheme(document.appConfig.theme);
+  document.editor?.updateOptions(document.appConfig.editorCreateOptions);
+  document.settingsEditor?.updateOptions(document.appConfig.editorCreateOptions);
+}
+
+
+// ==========================================================================================================
+// == dock (pop in) and undock (pop out) previewer ==
+
+function getDockUndockElements() {
+  return {
+    "btnUndock": document.getElementById("btn-undock"),
+    "btnDock": document.getElementById("btn-dock"),
+    "editorContainer": document.getElementById("editor-main-container"),
+    "previewContainer": document.getElementById("previewer-main-container"),
+  };
+}
+
+function hidePreview() {
+  const elements = getDockUndockElements();
+  setVisibility(elements.btnUndock, false);
+  // if not opened via button and therefore a popup, `window.close` won't work
+  setVisibility(elements.btnDock, window.opener);
+  if (elements.editorContainer) elements.editorContainer.style.width = "100%";
+  if (elements.previewContainer) setVisibility(elements.previewContainer, false);
+}
+
+function showPreview() {
+  const elements = getDockUndockElements();
+  setVisibility(elements.btnUndock, true);
+  setVisibility(elements.btnDock, false);
+  if (elements.editorContainer) elements.editorContainer.style.removeProperty("width");
+  if (elements.previewContainer) setVisibility(elements.previewContainer, true);
+}
+
+function undock() {
+  const url = new URL(window.location.href);
+  url.searchParams.set("view", "previewer");
+  const previewer = window.open(url, "PlantUML Diagram Previewer", "popup");
+  if (previewer) {
+    previewer.onbeforeunload = showPreview;
+    hidePreview();
+  }
+}
+
+
+// ==========================================================================================================
+// == paginator ==
+
+function getNumberOfDiagramPagesFromCode(code) {
+  // count `newpage` inside code
+  // known issue: a `newpage` starting in a newline inside a multiline comment will also be counted
+  return code.match(/^\s*newpage\s?.*$/gm)?.length + 1 || 1;
+}
+
+function updateNumberOfPagingElements(paginator, pages) {
+  // remove elements (buttons) if there are to many
+  while (paginator.childElementCount > pages) {
+    paginator.removeChild(paginator.lastChild)
+  }
+  // add elements (buttons) if there are to less
+  while (paginator.childElementCount < pages) {
+    const radioBtn = document.createElement("input");
+    radioBtn.name = "paginator";
+    radioBtn.type = "radio";
+    radioBtn.value = paginator.childElementCount;
+    radioBtn.addEventListener("click", (event) => {
+      sendMessage({
+        sender: "paginator",
+        data: { index: event.target.value },
+        synchronize: true,
+      });
+    });
+    paginator.appendChild(radioBtn);
+  }
+}
+
+function updatePaginator() {
+  const paginator = document.getElementById("paginator");
+  const pages = document.appData.numberOfDiagramPages;
+  if (pages > 1) {
+    updateNumberOfPagingElements(paginator, pages);
+    setVisibility(paginator, true);
+  } else {
+    setVisibility(paginator, false);
+  }
+}
+
+function updatePaginatorSelection() {
+  const paginator = document.getElementById("paginator");
+  const index = document.appData.index;
+  if (index === undefined) {
+    for (const node of paginator.childNodes) {
+      node.checked = false;
+    }
+  } else {
+    paginator.childNodes[index].checked = true;
+  }
+}
+
+
+// ==========================================================================================================
+// == sync data ==
+
+function updateDiagramMap(mapString, mapEl) {
+  const mapBtn = document.getElementById("map-diagram-link");
+  mapEl = mapEl || document.getElementById("plantuml_map");
+  if (mapString) {
+    const div = document.createElement("div");
+    div.innerHTML = mapString;
+    mapEl.parentNode.replaceChild(div.firstChild, mapEl);
+    setVisibility(mapBtn, true);
+  } else {
+    removeChildren(mapEl);
+    setVisibility(mapBtn, false);
+  }
+}
+
+function updateSvgDiagram(svgString, svgEl) {
+  svgEl = svgEl || document.getElementById("diagram-svg");
+  const div = document.createElement("div");
+  div.innerHTML = svgString;
+  const newSvg = div.querySelector("svg");
+  newSvg.id = "diagram-svg";
+  svgEl.parentNode.replaceChild(newSvg, svgEl);
+}
+
+function updateTxtDiagram(txtString, txtEl) {
+  txtEl = txtEl || document.getElementById("diagram-txt");
+  txtEl.innerHTML = txtString;
+}
+
+function syncDiagram(type, encodedDiagram, index) {
+  const container = document.getElementById("diagram");
+  const png = document.getElementById("diagram-png");
+  const map = document.getElementById("plantuml_map");
+  const svg = document.getElementById("diagram-svg");
+  const txt = document.getElementById("diagram-txt");
+  const pdf = document.getElementById("diagram-pdf");
+
+  return new Promise((resolve, reject) => {
+    if (type === "png") {
+      png.src = buildUrl(type, encodedDiagram, index);
+      requestDiagramMap(encodedDiagram, index, (mapString) => {
+        updateDiagramMap(mapString, map);
+        resolve();
+      });
+    } else if (type === "svg") {
+      requestDiagram(type, encodedDiagram, index, (svgString) => {
+        updateSvgDiagram(svgString, svg);
+        resolve();
+      });
+    } else if (type === "txt") {
+      requestDiagram(type, encodedDiagram, index, (svgString) => {
+        updateTxtDiagram(svgString, txt);
+        resolve();
+      });
+    } else if (type === "pdf") {
+      pdf.data = buildUrl(type, encodedDiagram, index);
+      resolve();
+    } else {
+      (console.error || console.log)("unknown diagram type:", type);
+      reject();
+    }
+  }).then(() => {
+    container.setAttribute("data-diagram-type", type);
+    setVisibility(png, type === "png");
+    setVisibility(map, type === "png");
+    setVisibility(svg, type === "svg");
+    setVisibility(txt, type === "txt");
+    setVisibility(pdf, type === "pdf");
+  });
+}
+
+function syncUrlTextInput(encodedDiagram, index) {
+  const target = document.getElementById("url");
+  document.appConfig.changeEventsEnabled = false;
+  target.value = resolvePath(buildUrl("png", encodedDiagram, index));
+  target.title = target.value;
+  document.appConfig.changeEventsEnabled = true;
+}
+
+function syncCodeEditor(code) {
+  document.appConfig.changeEventsEnabled = false;
+  document.editor.getModel().setValue(code);
+  document.appConfig.changeEventsEnabled = true;
+}
+
+function syncBrowserHistory(encodedDiagram, index) {
+  const url = replaceUrl(window.location.href, encodedDiagram, index).url;
+  history.replaceState(history.stat, document.title, url);
+}
+
+function syncStaticPageData(includePaginatorUpdates) {
+  document.appConfig.autoRefreshState = "syncing";
+  const encodedDiagram = document.appData.encodedDiagram;
+  const index =  document.appData.index;
+  return Promise.all([
+    // update URL input
+    new Promise((resolve, _reject) => {
+      if (document.getElementById("url")) {
+        syncUrlTextInput(encodedDiagram, index);
+      }
+      resolve();
+    }),
+    // update diagram image
+    syncDiagram(document.appConfig.diagramPreviewType, encodedDiagram, index),
+    // update external diagram links
+    new Promise((resolve, _reject) => {
+      for (let target of document.getElementsByClassName("diagram-link")) {
+        target.href = buildUrl(target.dataset.imgType, encodedDiagram, index);
+      }
+      resolve();
+    }),
+    // update paginator
+    new Promise((resolve, _reject) => {
+      if (includePaginatorUpdates) {
+        updatePaginator();
+        updatePaginatorSelection();
+      }
+      resolve();
+    }),
+    // update browser url as well as the browser history
+    new Promise((resolve, _reject) => {
+      syncBrowserHistory(encodedDiagram, index);
+      resolve();
+    }),
+  ]).then(() => {
+    // set auto refresh state to complete
+    document.appConfig.autoRefreshState = "complete";
+  });
+}
+
+
+// ==========================================================================================================
+// == initialize app ==
+
+async function initializeApp(view) {
+  await loadCodeEditor();
+  if (view !== "previewer") {
+    initializeCodeEditor();
+    initializeUrlInput();
+  }
+  initializeAppData();
+  initTheme();
+  await initializeDiagram();
+  initializePaginator();
+  if (view !== "previewer") {
+    addSavePlantumlDocumentEvent();
+  }
+  if (["previewer", "editor"].includes(view)) {
+    hidePreview();
+  }
+  document.appConfig.autoRefreshState = "complete";
+}
+
+function loadCodeEditor() {
+  // load Monaco editor asynchron
+  return new Promise((resolve, _reject) => {
+    require.config({ paths: { vs: "webjars/monaco-editor/0.36.1/min/vs" } });
+    require(["vs/editor/editor.main"], resolve);
+  });
+}
+
+function initializeCodeEditor() {
+  // create editor model including editor watcher
+  let timer = 0;
+  const uri = monaco.Uri.parse("inmemory://plantuml");
+  const initCodeEl = document.getElementById("initCode");
+  const initCode = initCodeEl.value;
+  initCodeEl.remove();
+  const plantumlFeatures = new PlantUmlLanguageFeatures();
+  const model = monaco.editor.createModel(initCode, "apex", uri);
+  model.onDidChangeContent(() => {
+    clearTimeout(timer);
+    if (document.appConfig.changeEventsEnabled) {
+      document.appConfig.autoRefreshState = "waiting";
+      timer = setTimeout(() => {
+        document.appConfig.autoRefreshState = "started";
+        const code = model.getValue();
+        const numberOfDiagramPages = getNumberOfDiagramPagesFromCode(code);
+        let index = document.appData.index;
+        if (index === undefined || numberOfDiagramPages === 1) {
+          index = undefined;
+        } else if (index >= numberOfDiagramPages) {
+          index = numberOfDiagramPages - 1;
+        }
+        encodeDiagram(code, (encodedDiagram) => {
+          sendMessage({
+            sender: "editor",
+            data: { encodedDiagram, numberOfDiagramPages, index },
+            synchronize: true,
+          });
        });
-        navigator.permissions.query({ name: "clipboard-read" }).then((result) => {
-            if (result.state == "granted" || result.state == "prompt") {
-                clipboard_read = true;
-            }
+        plantumlFeatures.validateCode(model)
+          .then(markers => monaco.editor.setModelMarkers(model, "plantuml", markers));
+      }, document.appConfig.editorWatcherTimeout);
+    }
+  });
+  // create editor
+  document.editor = monaco.editor.create(document.getElementById("monaco-editor"), {
+    model, ...document.appConfig.editorCreateOptions
+  });
+  // sometimes the monaco editor has resize problems
+  document.addEventListener("resize", () => document.editor.layout());
+}
+
+function initializeUrlInput() {
+  // resolve relative path inside url input once
+  const urlInput = document.getElementById("url");
+  urlInput.value = resolvePath(urlInput.value);
+  urlInput.title = urlInput.value;
+
+  // update editor and everything else if the URL input is changed
+  urlInput.addEventListener("change", (event) => {
+    if (document.appConfig.changeEventsEnabled) {
+      document.appConfig.autoRefreshState = "started";
+      const analysedUrl = analyseUrl(event.target.value);
+      decodeDiagram(analysedUrl.encodedDiagram, (code) => {
+        syncCodeEditor(code);
+        sendMessage({
+          sender: "url",
+          data: {
+            encodedDiagram: analysedUrl.encodedDiagram,
+            index: analysedUrl.index,
+          },
+          synchronize: true,
        });
+      });
+    }
+  });
+}
+
+function initializeAppData() {
+  const analysedUrl = analyseUrl(window.location.href);
+  const code = document.editor?.getValue();
+  document.appData = Object.assign({}, window.opener?.document.appData);
+  if (Object.keys(document.appData).length === 0) {
+    document.appData = {
+      encodedDiagram: analysedUrl.encodedDiagram,
+      index: analysedUrl.index,
+      numberOfDiagramPages: (code) ? getNumberOfDiagramPagesFromCode(code) : 1,
    };
+  }
+}
+
+function initTheme() {
+  function changeEditorThemeSettingIfNecessary(theme) {
+    if (theme === "dark" && document.appConfig.editorCreateOptions.theme === "vs") {
+      document.appConfig.editorCreateOptions.theme = "vs-dark";
+    }
+    if (theme === "light" && document.appConfig.editorCreateOptions.theme === "vs-dark") {
+      document.appConfig.editorCreateOptions.theme = "vs";
+    }
+  }
+  // set theme to last saved settings or browser preference or "light"
+  document.appConfig.theme = document.appConfig.theme || getBrowserThemePreferences() || "light";
+  setTheme(document.appConfig.theme);
+  changeEditorThemeSettingIfNecessary(document.appConfig.theme);
+  // listen to browser change event
+  window.matchMedia("(prefers-color-scheme: dark)").addEventListener("change", event => {
+    const theme = event.matches ? "dark" : "light";
+    document.appConfig.theme = theme
+    changeEditorThemeSettingIfNecessary(theme);
+    broadcastSettings(document.appConfig);
+  });
+}
+
+function initializeDiagram() {
+  if (document.appConfig.diagramPreviewType === "png") {
+    return Promise.resolve();  // png is initialized by default
+  }
+  return syncDiagram(
+    document.appConfig.diagramPreviewType,
+    document.appData.encodedDiagram,
+    document.appData.index
+  );
+}
+
+function initializePaginator() {
+  if (document.appData.numberOfDiagramPages > 1) {
+    updatePaginator();
+    updatePaginatorSelection();
+  }
+}
+
+function addSavePlantumlDocumentEvent() {
+  const PLATFORM = navigator?.userAgentData?.platform || navigator?.platform || "unknown";
+  document.addEventListener("keydown", function(e) {
+    if (e.key === "s" && (PLATFORM.match("Mac") ? e.metaKey : e.ctrlKey)) {
+      // support Ctrl+S to download diagram
+      e.preventDefault();
+      const code = document.editor.getValue();
+      const name = Array.from(
+        code.matchAll(/^\s*@start[a-zA-Z]*\s+([a-zA-Z-_äöüÄÖÜß ]+)\s*$/gm),
+        m => m[1]
+      )[0] || "diagram";
+      // download via link
+      const link = document.createElement("a");
+      link.download = name + ".puml";
+      link.href = "data:," + encodeURIComponent(code);
+      link.click();
+    }
+    if (e.key === "," && (PLATFORM.match("Mac") ? e.metaKey : e.ctrlKey)) {
+      // support Ctrl+, to open the settings
+      e.preventDefault();
+      if (document.getElementById("settings")?.style?.display === "none") {
+        openSettings();
+      }
+    }
+  }, false);
+}
+
+
+// ==========================================================================================================
+// == communication ==
+//
+// send and receive data: {
+//   sender: string = ["editor"|"url"|"paginator"|"settings"],
+//   data: {
+//     encodedDiagram: string | undefined,
+//     index: integer | undefined,
+//     numberOfDiagramPages: integer | undefined,
+//     appConfig: object | undefined
+//   } |  undefined,
+//   synchronize: boolean = false,
+//   reload: boolean = false,  // reload page
+//   force: boolean = false  // force synchronize or reload
+// }
+
+function sendMessage(data) {
+  (new BroadcastChannel("plantuml-server")).postMessage(data, window.location.origin);
+}
+
+function updateReceiveMessageData(data) {
+  if (!data || Object.keys(data).length === 0) return {};
+
+  const changedFlags = {};
+  if ("encodedDiagram" in data && data.encodedDiagram !== document.appData.encodedDiagram) {
+    document.appData.encodedDiagram = data.encodedDiagram;
+    changedFlags.diagram = true;
+  }
+  if ("index" in data && data.index !== document.appData.index) {
+    document.appData.index = data.index;
+    changedFlags.index = true;
+  }
+  if ("numberOfDiagramPages" in data && data.numberOfDiagramPages !== document.appData.numberOfDiagramPages) {
+    document.appData.numberOfDiagramPages = data.numberOfDiagramPages;
+    changedFlags.numberOfDiagramPages = true;
+  }
+  if ("appConfig" in data && data.appConfig !== document.appConfig) {
+    document.appConfig = data.appConfig;
+    changedFlags.appConfig = true;
+  }
+  return changedFlags;
+}
+
+async function receiveMessage(event) {
+  const data = event.data.data;
+  const force = event.data.force || false;
+  const changedFlags = updateReceiveMessageData(data);
+  if (event.data.synchronize === true) {
+    if (force || changedFlags.diagram || changedFlags.index || changedFlags.appConfig) {
+      await syncStaticPageData(false);
+    }
+    if (force || changedFlags.numberOfDiagramPages) {
+      updatePaginator();
+    }
+    if (force || changedFlags.numberOfDiagramPages || changedFlags.index) {
+      updatePaginatorSelection();
+    }
+    if (changedFlags.appConfig) {
+      applySettings();
+    }
+  }
+  if (event.data.reload === true) {
+    window.location.reload();
+  }
+}
+
+
+// ==========================================================================================================
+// == main entry ==
+
+window.onload = function() {
+  const view = new URL(window.location.href).searchParams.get("view")?.toLowerCase();
+  initializeApp(view);
+
+  // broadcast channel
+  const bc = new BroadcastChannel("plantuml-server");
+  bc.onmessage = receiveMessage;
 };
--- a/src/main/webapp/plantumllanguage.js
+++ b/src/main/webapp/plantumllanguage.js
@ -0,0 +1,384 @@
+/*******************************************
+* Monaco Editor PlantUML language features *
+********************************************/
+
+/**
+ * Monaco Editor PlantUML Language Features.
+ *
+ * @example
+ * ```js
+ * plantumlFeatures = new PlantUmlLanguageFeatures();
+ * const model = monaco.editor.createModel(initCode, "apex", uri);
+ * model.onDidChangeContent(() => plantumlFeatures.validateCode(model));
+ * ```
+ */
+const PlantUmlLanguageFeatures = (function() {
+  'use strict';
+
+  /**
+   * Create Monaco Editor PlantUML Language Features instance.
+   *
+   * @param {object} [options]  global instance options
+   */
+  function PlantUmlLanguageFeatures({
+    baseUrl = "",
+    languageSelector = ["apex", "plantuml"],
+    initialize = true
+  } = {}) {
+
+    const validationEventListeners = {};
+
+
+    // ==========================================================================================================
+    // == PlantUML valdation methods ==
+
+    /**
+     * Add validation event listener.
+     *
+     * Validation Event Order:
+     * before -> code -> line -> after
+     *
+     * @param {("before"|"code"|"line"|"after")} type  before|code|line|after event type
+     * @param {(event: any) => Promise<editor.IMarkerData>|editor.IMarkerData|Promise<editor.IMarkerData[]>|editor.IMarkerData[]|Promise<void>|void} listener  event listener
+     */
+    this.addValidationEventListener = (type, listener) => {
+      if (!["before", "code", "line", "after"].includes(type)) {
+        throw Error("Unknown validation event type: " + type);
+      }
+      validationEventListeners[type] = validationEventListeners[type] || [];
+      validationEventListeners[type].push(listener);
+    };
+
+    /**
+     * Validate PlantUML language of monaco editor model.
+     *
+     * @param {editor.ITextModel} model  editor model to validate
+     *
+     * @returns editor markers as promise
+     *
+     * @example
+     * ```js
+     * validateCode(editor.getModel())
+     *   .then(markers => monaco.editor.setModelMarkers(model, "plantuml", markers));
+     * ```
+     */
+    this.validateCode = async (model) => {
+      const promises = [];
+
+      // raise before events
+      promises.push(validationEventListeners.before?.map(listener => listener({ model })));
+
+      // raise code events
+      promises.push(validationEventListeners.code?.map(listener => listener({ model, code: model.getValue() })));
+
+      if (validationEventListeners.line && validationEventListeners.line.length > 0) {
+        // NOTE: lines and columns start at 1
+        const lineCount = model.getLineCount();
+        for (let lineNumber = 1; lineNumber <= lineCount; lineNumber++) {
+          const range = {
+            startLineNumber: lineNumber,
+            startColumn: 1,
+            endLineNumber: lineNumber,
+            endColumn: model.getLineLength(lineNumber) + 1,
+          };
+          const line = model.getValueInRange(range);
+          // raise line events
+          promises.push(validationEventListeners.line?.map(listener => listener({ model, range, line, lineNumber, lineCount })));
+        }
+      }
+
+      // raise after events
+      promises.push(validationEventListeners.after?.map(listener => listener({ model })));
+
+      // collect all markers and ...
+      // - since each event can results in an array of markers -> `flat(1)`
+      // - since not each event has to results in markers and can be `undef
+      return Promise.all(promises).then(results => results.flat(1).filter(marker => marker));
+    };
+
+    /**
+     * Add PlantUML `@start` and `@end` command validation.
+     */
+    this.addStartEndValidationListeners = () => {
+      let diagramType = undefined;
+      let startCounter = 0;
+      let endCounter = 0;
+
+      // reset validation cache
+      this.addValidationEventListener("before", () => {
+        diagramType = undefined;
+        startCounter = 0;
+        endCounter = 0;
+      });
+
+      // @start should be the first command
+      this.addValidationEventListener("code", ({ model, code }) => {
+        const match = code.match(/^(('.*)|\s)*@start(?<type>\w+)/);
+        if (match) {
+          diagramType = match.groups.type;
+          return;  // diagram code starts with a `@start`
+        }
+        return {
+          message: "PlantUML diagrams should begin with the `@start` command and `@start` should also be the first command.",
+          severity: monaco.MarkerSeverity.Warning,
+          startLineNumber: 1,
+          startColumn: 1,
+          endLineNumber: 1,
+          endColumn: model.getLineLength(1) + 1,
+        };
+      });
+
+      // @end should be the last command and should be of the same type (e.g. @startjson ... @endjson)
+      this.addValidationEventListener("code", ({ model, code }) => {
+        const lineCount = model.getLineCount();
+        const match = code.match(/\s+@end(?<type>\w+)(('.*)|\s)*$/);
+        if (match) {
+          if (diagramType === match.groups.type) {
+            return;  // diagram code ends with a `@end` of the same type as the `@start`
+          }
+          return {
+            message: "PlantUML diagrams should start and end with the type.\nExample: `@startjson ... @endjson`",
+            severity: monaco.MarkerSeverity.Error,
+            startLineNumber: lineCount,
+            startColumn: 1,
+            endLineNumber: lineCount,
+            endColumn: model.getLineLength(lineCount) + 1,
+          };
+        }
+        return {
+          message: "PlantUML diagrams should end with the `@end` command and `@end` should also be the last command.",
+          severity: monaco.MarkerSeverity.Warning,
+          startLineNumber: lineCount,
+          startColumn: 1,
+          endLineNumber: lineCount,
+          endColumn: model.getLineLength(lineCount) + 1,
+        };
+      });
+
+      // @start should only be used once
+      this.addValidationEventListener("line", ({ range, line }) => {
+        const match = line.match(/^\s*@start(?<type>\w+)(\s+.*)?$/);
+        if (!match) return;
+
+        startCounter += 1;
+        if (startCounter > 1) {
+          const word = "@start" + match.groups.type;
+          const wordIndex = line.indexOf(word);
+          return {
+            message: "Multiple @start commands detected.",
+            severity: monaco.MarkerSeverity.Warning,
+            startLineNumber: range.startLineNumber,
+            startColumn: wordIndex + 1,
+            endLineNumber: range.endLineNumber,
+            endColumn: wordIndex + word.length + 1,
+          };
+        }
+      });
+
+      // @end should only be used once
+      this.addValidationEventListener("line", ({ range, line }) => {
+        const match = line.match(/^\s*@end(?<type>\w+)(\s+.*)?$/);
+        if (!match) return;
+
+        endCounter += 1;
+        if (endCounter > 1) {
+          const word = "@end" + match.groups.type;
+          const wordIndex = line.indexOf(word);
+          return {
+            message: "Multiple @end commands detected.",
+            severity: monaco.MarkerSeverity.Warning,
+            startLineNumber: range.startLineNumber,
+            startColumn: wordIndex + 1,
+            endLineNumber: range.endLineNumber,
+            endColumn: wordIndex + word.length + 1,
+          };
+        }
+      });
+    };
+
+
+    // ==========================================================================================================
+    // == PlantUML code completion methods ==
+
+    this.registerThemeCompletion = () => {
+      const createThemeProposals = async (range, filter = undefined) => {
+        const themes = await this.getThemes();
+        return themes?.filter(theme => filter ? theme.includes(filter) : true)
+          .map(theme => ({
+            label: theme,
+            kind: monaco.languages.CompletionItemKind.Text,
+            documentation: "PlantUML " + theme + " theme",
+            insertText: theme,
+            range: range,
+          })) || [];
+      };
+
+      monaco.languages.registerCompletionItemProvider(languageSelector, {
+        triggerCharacters: [" "],
+        provideCompletionItems: async (model, position) => {
+          const textUntilPosition = model.getValueInRange({
+            startLineNumber: position.lineNumber,
+            startColumn: 1,
+            endLineNumber: position.lineNumber,
+            endColumn: position.column,
+          });
+          if (textUntilPosition.match(/^\s*!(t(h(e(m(e)?)?)?)?)?$/)) {
+            return {
+              suggestions: [
+                {
+                  label: 'theme',
+                  kind: monaco.languages.CompletionItemKind.Keyword,
+                  documentation: "PlantUML theme command",
+                  insertText: 'theme',
+                  range: getWordRange(model, position),
+                }
+              ]
+            };
+          }
+          const match = textUntilPosition.match(/^\s*!theme\s+(?<theme>[^\s]*)$/);
+          if (match) {
+            const suggestions = await createThemeProposals(getWordRange(model, position), match.groups.theme);
+            return { suggestions };
+          }
+          return { suggestions: [] };
+        }
+      });
+    };
+
+    this.registerIconCompletion = () => {
+      const createIconProposals = async (range, filter = undefined) => {
+        const icons = await this.getIcons();
+        return icons?.filter(icon => filter ? icon.includes(filter) : true)
+          .map(icon => {
+            // NOTE: markdown image path inside suggestions seems to have rendering issues while using relative paths
+            const iconUrl = this.resolvePath(baseUrl + "ui-helper?request=icons.svg#" + icon);
+            return {
+              label: icon,
+              kind: monaco.languages.CompletionItemKind.Constant,
+              documentation: {
+                //supportHtml: true,  // also a possibility but quite limited html
+                value: "![icon](" + iconUrl + ") &nbsp; " + icon
+              },
+              insertText: icon + ">",
+              range: range
+            };
+          }) || [];
+      };
+
+      monaco.languages.registerCompletionItemProvider(languageSelector, {
+        triggerCharacters: ["&"],
+        provideCompletionItems: async (model, position) => {
+          const textUntilPosition = model.getValueInRange({
+            startLineNumber: position.lineNumber,
+            startColumn: 1,
+            endLineNumber: position.lineNumber,
+            endColumn: position.column,
+          });
+          const match = textUntilPosition.match(/<&(?<icon>[^\s>]*)$/);
+          if (match) {
+            const suggestions = await createIconProposals(getWordRange(model, position), match.groups.icon);
+            return { suggestions };
+          }
+          return { suggestions: [] };
+        }
+      });
+    };
+
+
+    // ==========================================================================================================
+    // == helper methods ==
+
+    this.resolvePath = (path) => {
+      if (path.startsWith("http")) return path;
+      if (path.startsWith("/")) return window.location.origin + path;
+
+      if (path.slice(0, 2) == "./") path = path.slice(2);
+      let base = (document.querySelector("base") || {}).href || window.location.origin;
+      if (base.slice(-1) == "/") base = base.slice(0, -1);
+      return base + "/" + path;
+    };
+
+    this.getIcons = (function(){
+      let icons = undefined;
+      return async () => {
+        if (icons === undefined) {
+          icons = await makeRequest("GET", "ui-helper?request=icons", { responseType: "json" });
+        }
+        return icons;
+      }
+    })();
+
+    this.getThemes = (function(){
+      let themes = undefined;
+      return async () => {
+        if (themes === undefined) {
+          themes = await makeRequest("GET", "ui-helper?request=themes", { responseType: "json" });
+        }
+        return themes;
+      }
+    })();
+
+    const makeRequest = (
+      method,
+      url,
+      { data = null, headers = { "Content-Type": "text/plain" }, responseType = "text", ignoreBaseUrl = false } = {}
+    ) => {
+      const targetUrl = (ignoreBaseUrl === true) ? url : baseUrl + url;
+      return new Promise((resolve, reject) => {
+        const xhr = new XMLHttpRequest();
+        xhr.onreadystatechange = function() {
+          if (xhr.readyState === XMLHttpRequest.DONE) {
+            if (xhr.status >= 200 && xhr.status <= 300) {
+              if (responseType === "json") {
+                resolve(xhr.response);
+              } else {
+                resolve(xhr.responseText);
+              }
+            } else {
+              if (responseType === "json") {
+                reject({ status: xhr.status, response: xhr.response });
+              } else {
+                reject({ status: xhr.status, responseText: xhr.responseText });
+              }
+            }
+          }
+        }
+        xhr.open(method, targetUrl, true);
+        xhr.responseType = responseType;
+        headers && Object.keys(headers).forEach(key => xhr.setRequestHeader(key, headers[key]));
+        xhr.send(data);
+      });
+    };
+
+    const getWordRange = (model, position) => {
+      const word = model.getWordUntilPosition(position);
+      return {
+        startLineNumber: position.lineNumber,
+        endLineNumber: position.lineNumber,
+        startColumn: word.startColumn,
+        endColumn: word.endColumn,
+      };
+    }
+
+
+    // ==========================================================================================================
+    // == constructor running code ==
+
+    // prepare base URL
+    if (baseUrl === null || baseUrl === undefined) {
+      baseUrl = "";
+    } else if (baseUrl !== "") {
+      // add tailing "/"
+      if (baseUrl.slice(-1) !== "/") baseUrl = baseUrl + "/";
+    }
+
+    // initialize default validation and code completion
+    if (initialize) {
+      this.addStartEndValidationListeners();
+      this.registerThemeCompletion();
+      this.registerIconCompletion();
+    }
+  }
+
+  return PlantUmlLanguageFeatures;
+})();
--- a/src/main/webapp/previewer.jsp
+++ b/src/main/webapp/previewer.jsp
@ -0,0 +1,26 @@
+<%@ page info="index" contentType="text/html; charset=utf-8" pageEncoding="utf-8" session="false" %>
+<%
+  // diagram sources
+  String encoded = request.getAttribute("encoded").toString();
+  String index = request.getAttribute("index").toString();
+  String diagramUrl = ((index.isEmpty()) ? "" : index + "/") + encoded;
+  // map for diagram source if necessary
+  String map = request.getAttribute("map").toString();
+  boolean hasMap = !map.isEmpty();
+  // properties
+  boolean showSocialButtons = (boolean)request.getAttribute("showSocialButtons");
+%>
+
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
+<head>
+  <%@ include file="resource/htmlheadbase.jsp" %>
+  <title>PlantUML Server</title>
+</head>
+<body>
+  <div class="content viewer-content">
+    <%-- Preview --%>
+    <%@ include file="resource/preview.jsp" %>
+  </div>
+</body>
+</html>
--- a/src/main/webapp/resource/footer.jsp
+++ b/src/main/webapp/resource/footer.jsp
@ -0,0 +1 @@
+<p><%= net.sourceforge.plantuml.version.Version.fullDescription() %></p>
--- a/src/main/webapp/resource/githubribbon.html
+++ b/src/main/webapp/resource/githubribbon.html
@ -1 +1,17 @@
-<a href="https://github.com/plantuml/plantuml-server"><img style="position: absolute; top: 0; right: 0; border: 0;" src="https://github-camo.global.ssl.fastly.net/a6677b08c955af8400f44c6298f40e7d19cc5b2d/68747470733a2f2f73332e616d617a6f6e6177732e636f6d2f6769746875622f726962626f6e732f666f726b6d655f72696768745f677261795f3664366436642e706e67" alt="Fork me on GitHub" data-canonical-src="https://s3.amazonaws.com/github/ribbons/forkme_right_gray_6d6d6d.png"></a>
+<div>
+	<img
+		style="display: inline; position: absolute; top: 0; right: 0; border: 0; max-width: 35%;"
+		class="no-filter"
+		src="assets/github-fork-me.png"
+		alt="Fork me on GitHub"
+		usemap="#github-banner"
+	/>
+	<map id="github-banner" name="github-banner" style="cursor: pointer;">
+    <area
+			shape="poly"
+			coords="15,0 59,0 149,90 149,134"
+			href="https://github.com/plantuml/plantuml-server"
+			alt="Fork me on GitHub"
+		/>
+  </map>
+</div>
--- a/src/main/webapp/resource/htmlheadbase.jsp
+++ b/src/main/webapp/resource/htmlheadbase.jsp
@ -0,0 +1,16 @@
+<base href="<%= request.getContextPath() %>/" />
+<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
+<meta http-equiv="expires" content="0" />
+<meta http-equiv="pragma" content="no-cache" />
+<meta http-equiv="cache-control" content="no-cache, must-revalidate" />
+<meta name="color-scheme" content="light dark" />
+<link rel="icon" href="favicon.ico" type="image/x-icon"/>
+<link rel="shortcut icon" href="favicon.ico" type="image/x-icon"/>
+<link rel="stylesheet" href="plantuml.css" />
+<script src="webjars/monaco-editor/0.36.1/min/vs/loader.js"></script>
+<script src="plantumllanguage.js"></script>
+<script src="plantuml.js"></script>
+<script>
+  const VERSION = <%= net.sourceforge.plantuml.version.Version.version() %>;
+  const VERSION_STRING = "<%= net.sourceforge.plantuml.version.Version.versionString() %>";
+</script>
--- a/src/main/webapp/resource/preview.jsp
+++ b/src/main/webapp/resource/preview.jsp
@ -0,0 +1,89 @@
+<div class="previewer-container flex-rows">
+  <div class="preview-menu">
+    <div class="diagram-links flex-columns">
+      <span>View as:</span>
+      <a class="diagram-link" data-img-type="png" href="png/<%= diagramUrl %>" title="View diagram as PNG">
+        <img src="assets/file-types/png.svg" alt="PNG" />
+      </a>
+      <a class="diagram-link" data-img-type="svg" href="svg/<%= diagramUrl %>" title="View diagram as SVG">
+        <img src="assets/file-types/svg.svg" alt="SVG" />
+      </a>
+      <a class="diagram-link" data-img-type="txt" href="txt/<%= diagramUrl %>" title="View diagram as ASCII Art">
+        <img src="assets/file-types/ascii.svg" alt="ASCII Art" />
+      </a>
+      <a class="diagram-link" data-img-type="pdf" href="pdf/<%= diagramUrl %>" title="View diagram as PDF">
+        <img src="assets/file-types/pdf.svg" alt="PDF" />
+      </a>
+      <a
+        id="map-diagram-link"
+        class="diagram-link"
+        data-img-type="map"
+        href="map/<%= diagramUrl %>"
+        title="View diagram as Map Data"
+        <% if (!hasMap) { %>
+          style="display: none;"
+        <% } %>
+      >
+          <img src="assets/file-types/map.svg" alt="MAP" />
+      </a>
+      <div class="flex-main menu-r">
+        <div class="btn-float-r">
+          <input
+            id="btn-settings"
+            class="btn-settings"
+            type="image"
+            src="assets/settings.svg"
+            alt="settings"
+            onclick="openSettings();"
+          />
+          <input
+            id="btn-undock"
+            class="btn-dock"
+            type="image"
+            src="assets/undock.svg"
+            alt="undock"
+            onclick="undock();"
+          />
+          <input
+            id="btn-dock"
+            class="btn-dock"
+            type="image"
+            src="assets/dock.svg"
+            alt="dock"
+            onclick="window.close();"
+            style="display: none;"
+          />
+        </div>
+      </div>
+    </div>
+  </div>
+  <div class="hr"></div>
+  <div id="paginator" data-number-of-diagram-pages="1" style="display: none;"></div>
+  <div class="previewer-main flex-main">
+    <div id="diagram" class="diagram">
+      <div>
+        <!-- PNG -->
+        <img id="diagram-png" src="png/<%= diagramUrl %>" alt="PlantUML diagram" usemap="#plantuml_map" />
+        <% if (hasMap) { %>
+          <%= map %>
+        <% } else { %>
+          <map id="plantuml_map" name="plantuml_map"></map>
+        <% } %>
+        <!-- SVG -->
+        <svg id="diagram-svg" style="display: none;"></svg>
+        <!-- ASCII Art -->
+        <pre id="diagram-txt" style="display: none;"></pre>
+        <!-- PDF -->
+        <object id="diagram-pdf" data="" type="application/pdf" width="100%" height="100%" style="display: none;">
+          <p>Unable to display PDF file.</p>
+        </object>
+      </div>
+    </div>
+  </div>
+  <% if (showSocialButtons) { %>
+    <div>
+      <%@ include file="socialbuttons2.jsp" %>
+    </div>
+  <% } %>
+  <%@ include file="settings.jsp" %>
+</div>
--- a/src/main/webapp/resource/settings.jsp
+++ b/src/main/webapp/resource/settings.jsp
@ -0,0 +1,39 @@
+<div id="settings" class="modal" style="display: none;" tabindex="-1">
+  <div class="modal-content flex-rows">
+    <div class="settings-header">
+      <h2>Settings</h2>
+      <div class="hr"></div>
+    </div>
+    <div class="settings-main flex-main">
+      <div class="setting flex-columns">
+        <label for="theme">Theme:</label>
+        <select class="flex-main" id="theme" name="theme">
+          <option value="light">Light</option>
+          <option value="dark">Dark</option>
+        </select>
+      </div>
+      <div class="setting flex-columns">
+        <label for="diagramPreviewType">Diagram Preview Type:</label>
+        <select class="flex-main" id="diagramPreviewType" name="diagramPreviewType">
+          <option value="png">PNG</option>
+          <option value="svg">SVG</option>
+          <option value="txt">ASCII Art</option>
+          <option value="pdf">PDF</option>
+        </select>
+      </div>
+      <div class="setting flex-columns">
+        <label for="editorWatcherTimeout">Editor Watcher Timeout:</label>
+        <input class="flex-main" id="editorWatcherTimeout" type="number" pattern="[1-9]+[0-9]*" value="" />
+      </div>
+      <div class="setting flex-main">
+        <label for="editorCreateOptions">Monaco Editor Create Options:</label>
+        <br />
+        <div id="settings-monaco-editor"></div>
+      </div>
+    </div>
+    <div class="settings-footer">
+      <input class="ok" type="button" value="Save" onclick="saveSettings();" />
+      <input class="cancel" type="button" value="Cancel" onclick="closeSettings();" />
+    </div>
+  </div>
+</div>
--- a/src/main/webapp/resource/socialbuttons2.jspf
+++ b/src/main/webapp/resource/socialbuttons2.jspf
--- a/src/test/java/net/sourceforge/plantuml/servlet/AllTests.java
+++ b/src/test/java/net/sourceforge/plantuml/servlet/AllTests.java
@ -8,7 +8,7 @@ public class AllTests extends TestSuite {
    public static Test suite() {
        TestSuite suite = new TestSuite(AllTests.class.getName());
        // $JUnit-BEGIN$
-        suite.addTestSuite(TestForm.class);
+        suite.addTestSuite(TestWebUI.class);
        suite.addTestSuite(TestImage.class);
        suite.addTestSuite(TestAsciiArt.class);
        suite.addTestSuite(TestSVG.class);
--- a/src/test/java/net/sourceforge/plantuml/servlet/TestAsciiArt.java
+++ b/src/test/java/net/sourceforge/plantuml/servlet/TestAsciiArt.java
@ -4,6 +4,9 @@ import java.io.IOException;
 import java.net.URL;
 import java.net.URLConnection;

+import net.sourceforge.plantuml.servlet.utils.TestUtils;
+import net.sourceforge.plantuml.servlet.utils.WebappTestCase;
+

 public class TestAsciiArt extends WebappTestCase {

--- a/src/test/java/net/sourceforge/plantuml/servlet/TestAsciiCoder.java
+++ b/src/test/java/net/sourceforge/plantuml/servlet/TestAsciiCoder.java
@ -6,6 +6,9 @@ import java.net.HttpURLConnection;
 import java.net.URL;
 import java.net.URLConnection;

+import net.sourceforge.plantuml.servlet.utils.TestUtils;
+import net.sourceforge.plantuml.servlet.utils.WebappTestCase;
+

 public class TestAsciiCoder extends WebappTestCase {

--- a/src/test/java/net/sourceforge/plantuml/servlet/TestCharset.java
+++ b/src/test/java/net/sourceforge/plantuml/servlet/TestCharset.java
@ -4,6 +4,8 @@ import java.io.IOException;
 import java.net.URL;
 import java.net.URLConnection;

+import net.sourceforge.plantuml.servlet.utils.WebappTestCase;
+

 public class TestCharset extends WebappTestCase {

--- a/src/test/java/net/sourceforge/plantuml/servlet/TestCheck.java
+++ b/src/test/java/net/sourceforge/plantuml/servlet/TestCheck.java
@ -4,6 +4,9 @@ import java.io.IOException;
 import java.net.URL;
 import java.net.URLConnection;

+import net.sourceforge.plantuml.servlet.utils.TestUtils;
+import net.sourceforge.plantuml.servlet.utils.WebappTestCase;
+

 public class TestCheck extends WebappTestCase {

--- a/src/test/java/net/sourceforge/plantuml/servlet/TestForm.java
+++ b/src/test/java/net/sourceforge/plantuml/servlet/TestForm.java
@ -1,303 +0,0 @@
-package net.sourceforge.plantuml.servlet;
-
-import static org.junit.Assert.assertNotEquals;
-
-import java.io.IOException;
-import java.util.List;
-
-import com.gargoylesoftware.htmlunit.WebClient;
-import com.gargoylesoftware.htmlunit.html.DomElement;
-import com.gargoylesoftware.htmlunit.html.HtmlForm;
-import com.gargoylesoftware.htmlunit.html.HtmlImage;
-import com.gargoylesoftware.htmlunit.html.HtmlInput;
-import com.gargoylesoftware.htmlunit.html.HtmlPage;
-import com.gargoylesoftware.htmlunit.html.HtmlSubmitInput;
-import com.gargoylesoftware.htmlunit.html.HtmlTextArea;
-
-
-public class TestForm extends WebappTestCase {
-
-    /**
-     * Verifies that the welcome page has exactly two form with the Bob --> Alice sample
-     */
-    public void testWelcomePage() throws IOException {
-        try (final WebClient webClient = new WebClient()) {
-            HtmlPage page = webClient.getPage(getServerUrl());
-            // Analyze response
-            List<HtmlForm> forms = page.getForms();
-            assertEquals(2, forms.size());
-            // Ensure the Text field is correct
-            String text = ((HtmlTextArea)(forms.get(0).getFirstByXPath("//textarea[contains(@name, 'text')]"))).getTextContent();
-            assertEquals(TestUtils.SEQBOBCODE, text);
-            // Ensure the URL field is correct
-            HtmlInput url = forms.get(1).getInputByName("url");
-            assertNotNull(url);
-            assertTrue(url.getAttribute("value").endsWith("/png/" + TestUtils.SEQBOB));
-            // Ensure the generated image is present
-            HtmlImage img = page.getFirstByXPath("//img[contains(@alt, 'PlantUML diagram')]");
-            assertNotEquals(0, img.getImageReader().getHeight(0));  // 131
-            assertNotEquals(0, img.getImageReader().getWidth(0));   // 120
-        }
-    }
-
-    /**
-     * Verifies that the version image is generated
-     */
-    public void testVersion() throws IOException {
-        try (final WebClient webClient = new WebClient()) {
-            HtmlPage page = webClient.getPage(getServerUrl());
-            page.initialize();
-            // Fill the form and submit it
-            page.executeJavaScript("document.myCodeMirror.setValue('version')");
-            HtmlForm form = page.getForms().get(0);
-            HtmlSubmitInput btn = form.getFirstByXPath("//input[contains(@type, 'submit')]");
-            page = btn.click();
-            // Analyze response
-            List<HtmlForm> forms = page.getForms();
-            assertEquals(2, forms.size());
-            // Ensure the Text field is correct
-            String text = ((HtmlTextArea)(forms.get(0).getFirstByXPath("//textarea[contains(@name, 'text')]"))).getTextContent();
-            assertEquals(TestUtils.VERSIONCODE, text);
-            // Ensure the URL field is correct
-            HtmlInput url = forms.get(1).getInputByName("url");
-            assertNotNull(url);
-            assertTrue(url.getAttribute("value").endsWith("/png/" + TestUtils.VERSION));
-            // Ensure the generated image is present
-            HtmlImage img = page.getFirstByXPath("//img[contains(@alt, 'PlantUML diagram')]");
-            assertNotEquals(0, img.getImageReader().getHeight(0));  // 186
-            assertNotEquals(0, img.getImageReader().getWidth(0));   // 519
-        }
-    }
-
-    /**
-     * Verifies that when the UML text is empty, default page and image is generated
-     */
-    public void testEmptyText() throws IOException {
-        try (final WebClient webClient = new WebClient()) {
-            HtmlPage page = webClient.getPage(getServerUrl());
-            page.initialize();
-            // Fill the form and submit it
-            page.executeJavaScript("document.myCodeMirror.setValue('')");
-            HtmlForm form = page.getForms().get(0);
-            HtmlSubmitInput btn = form.getFirstByXPath("//input[contains(@type, 'submit')]");
-            page = btn.click();
-            // Analyze response
-            List<HtmlForm> forms = page.getForms();
-            assertEquals(2, forms.size());
-            // Ensure the Text field is correct
-            String text = ((HtmlTextArea)(forms.get(0).getFirstByXPath("//textarea[contains(@name, 'text')]"))).getTextContent();
-            assertEquals(TestUtils.SEQBOBCODE, text);
-            // Ensure the URL field is correct
-            HtmlInput url = forms.get(1).getInputByName("url");
-            assertNotNull(url);
-            assertTrue(url.getAttribute("value").endsWith("/png/" + TestUtils.SEQBOB));
-            // Ensure the generated image is present
-            HtmlImage img = page.getFirstByXPath("//img[contains(@alt, 'PlantUML diagram')]");
-            assertNotEquals(0, img.getImageReader().getHeight(0));  // 131
-            assertNotEquals(0, img.getImageReader().getWidth(0));   // 120
-        }
-    }
-
-    /**
-     * Verifies that when the encoded URL is empty, default page and image is generated
-     */
-    public void testEmptyUrl() throws IOException {
-        try (final WebClient webClient = new WebClient()) {
-            HtmlPage page = webClient.getPage(getServerUrl());
-            page.initialize();
-            // Fill the form and submit it
-            List<HtmlForm> forms = page.getForms();
-            HtmlInput url = forms.get(1).getInputByName("url");
-            url.setAttribute("value", "");
-            HtmlSubmitInput btn = forms.get(1).getFirstByXPath("//input[contains(@type, 'submit')]");
-            page = btn.click();
-            // Analyze response
-            forms = page.getForms();
-            assertEquals(2, forms.size());
-            // Ensure the Text field is correct
-            String text = ((HtmlTextArea)(forms.get(0).getFirstByXPath("//textarea[contains(@name, 'text')]"))).getTextContent();
-            assertEquals(TestUtils.SEQBOBCODE, text);
-            // Ensure the URL field is correct
-            url = forms.get(1).getInputByName("url");
-            assertNotNull(url);
-            assertTrue(url.getAttribute("value").endsWith("/png/" + TestUtils.SEQBOB));
-            // Ensure the generated image is present
-            HtmlImage img = page.getFirstByXPath("//img[contains(@alt, 'PlantUML diagram')]");
-            assertNotEquals(0, img.getImageReader().getHeight(0));  // 131
-            assertNotEquals(0, img.getImageReader().getWidth(0));   // 120
-        }
-    }
-
-    /**
-     * Verifies that a ditaa diagram is generated
-     */
-    public void testDitaaText() throws IOException {
-        try (final WebClient webClient = new WebClient()) {
-            HtmlPage page = webClient.getPage(getServerUrl());
-            page.initialize();
-            // Fill the form and submit it
-            page.executeJavaScript("document.myCodeMirror.setValue(`@startditaa \n*--> \n@endditaa`)");
-            HtmlForm form = page.getForms().get(0);
-            HtmlSubmitInput btn = form.getFirstByXPath("//input[contains(@type, 'submit')]");
-            page = btn.click();
-            // Analyze response
-            List<HtmlForm> forms = page.getForms();
-            assertEquals(2, forms.size());
-            // Ensure the Text field is correct
-            String text = ((HtmlTextArea)(forms.get(0).getFirstByXPath("//textarea[contains(@name, 'text')]"))).getTextContent();
-            assertEquals("@startditaa \n*--> \n@endditaa", text);
-            // Ensure the URL field is correct
-            HtmlInput url = forms.get(1).getInputByName("url");
-            assertNotNull(url);
-            assertTrue(url.getAttribute("value").endsWith("/png/SoWkIImgISaiIKnKuDBIrRLJu798pKi12m00"));
-            // Ensure the generated image is present
-            HtmlImage img = page.getFirstByXPath("//img[contains(@alt, 'PlantUML diagram')]");
-            assertNotEquals(0, img.getImageReader().getHeight(0));  // 70
-            assertNotEquals(0, img.getImageReader().getWidth(0));   // 90
-        }
-    }
-
-    /**
-     * Verifies that an image map is produced if the diagram contains a link
-     */
-    public void testImageMap() throws IOException {
-        try (final WebClient webClient = new WebClient()) {
-            HtmlPage page = webClient.getPage(getServerUrl());
-            page.initialize();
-            // Fill the form and submit it
-            page.executeJavaScript("document.myCodeMirror.setValue(`@startuml\nBob -> Alice : [[http://yahoo.com]] Hello\n@enduml`)");
-            HtmlForm form = page.getForms().get(0);
-            HtmlSubmitInput btn = form.getFirstByXPath("//input[contains(@type, 'submit')]");
-            page = btn.click();
-            // Analyze response
-            List<HtmlForm> forms = page.getForms();
-            assertEquals(2, forms.size());
-            // Ensure the Text field is correct
-            String text = ((HtmlTextArea)(forms.get(0).getFirstByXPath("//textarea[contains(@name, 'text')]"))).getTextContent();
-            assertEquals("@startuml\nBob -> Alice : [[http://yahoo.com]] Hello\n@enduml", text);
-            // Ensure the URL field is correct
-            HtmlInput url = forms.get(1).getInputByName("url");
-            assertNotNull(url);
-            assertTrue(url.getAttribute("value").endsWith("/png/SyfFKj2rKt3CoKnELR1IY8xEA2afiDBNhqpCoC_NIyxFZOrLy4ZDoSa70000"));
-            // Ensure the generated image is present
-            HtmlImage img = page.getFirstByXPath("//img[contains(@alt, 'PlantUML diagram')]");
-            assertNotEquals(0, img.getImageReader().getHeight(0));  // 131
-            assertNotEquals(0, img.getImageReader().getWidth(0));   // 231
-            // Ensure the image map is present
-            DomElement map = page.getElementById("plantuml_map");
-            assertNotNull(map);
-            assertEquals(1, map.getChildElementCount());
-        }
-    }
-
-    /**
-     * Verifies that when the encoded source is specified as an URL parameter
-     * the diagram is displayed and the source is decoded
-     */
-    public void testUrlParameter() throws IOException {
-        try (final WebClient webClient = new WebClient()) {
-            // Submit the request with a url parameter
-            HtmlPage page = webClient.getPage(getServerUrl() + "/form?url=" + TestUtils.SEQBOB);
-            page.initialize();
-            // Analyze response
-            List<HtmlForm> forms = page.getForms();
-            assertEquals(2, forms.size());
-            // Ensure the Text field is correct
-            String text = ((HtmlTextArea)(forms.get(0).getFirstByXPath("//textarea[contains(@name, 'text')]"))).getTextContent();
-            assertEquals(TestUtils.SEQBOBCODE, text);
-            // Ensure the URL field is correct
-            HtmlInput url = forms.get(1).getInputByName("url");
-            assertNotNull(url);
-            assertTrue(url.getAttribute("value").endsWith("/png/" + TestUtils.SEQBOB));
-            // Ensure the generated image is present
-            HtmlImage img = page.getFirstByXPath("//img[contains(@alt, 'PlantUML diagram')]");
-            assertNotEquals(0, img.getImageReader().getHeight(0));  // 131
-            assertNotEquals(0, img.getImageReader().getWidth(0));   // 120
-        }
-    }
-
-    /**
-     * Verifies that an multipage diagram renders correct given index.
-     *
-     * Bob -> Alice : hello
-     * newpage
-     * Bob <- Alice : hello
-     * Bob -> Alice : let's talk
-     * Bob <- Alice : better not
-     * Bob -> Alice : <&rain> bye
-     * newpage
-     * Bob <- Alice : bye
-     */
-    public void testIndexPage() throws IOException {
-        try (final WebClient webClient = new WebClient()) {
-            HtmlPage page = webClient.getPage(
-                getServerUrl() + "/uml/1/" +
-                "SyfFKj2rKt3CoKnELR1Io4ZDoSddoaijBqXCJ-Lo0ahQwA99Eg7go4ajKIzMA4dCoKPNdfHQKf9Qf92NNuAknqQjA34ppquXgJ8Lbrr0AG00"
-            );
-            // Analyze response
-            List<HtmlForm> forms = page.getForms();
-            assertEquals(2, forms.size());
-            // Ensure the Text field is correct
-            String text = ((HtmlTextArea)(forms.get(0).getFirstByXPath("//textarea[contains(@name, 'text')]"))).getTextContent();
-            assertEquals(
-                "@startuml\nBob -> Alice : hello\nnewpage\nBob <- Alice : hello\nBob -> Alice : let's talk\nBob <- Alice : better not\nBob -> Alice : <&rain> bye\nnewpage\nBob <- Alice : bye\n@enduml",
-                text
-            );
-            // Ensure the URL field is correct
-            HtmlInput url = forms.get(1).getInputByName("url");
-            assertNotNull(url);
-            assertTrue(url.getAttribute("value").endsWith("/png/1/SyfFKj2rKt3CoKnELR1Io4ZDoSddoaijBqXCJ-Lo0ahQwA99Eg7go4ajKIzMA4dCoKPNdfHQKf9Qf92NNuAknqQjA34ppquXgJ8Lbrr0AG00"));
-            // Ensure the generated image is present
-            HtmlImage img = page.getFirstByXPath("//img[contains(@alt, 'PlantUML diagram')]");
-            int height = img.getImageReader().getHeight(0);
-            assertNotEquals(0, height);  // 222
-            assertNotEquals(0, img.getImageReader().getWidth(0));  // 152
-            // Ensure the correct index was generated
-            assertTrue(height > 200);  // 222
-            assertTrue(height < 250);  // 222
-        }
-    }
-
-    /**
-     * Verifies that an multipage diagram renders correct even if no index is specified.
-     *
-     * Bob -> Alice : hello
-     * newpage
-     * Bob <- Alice : hello
-     * Bob -> Alice : let's talk
-     * Bob <- Alice : better not
-     * Bob -> Alice : <&rain> bye
-     * newpage
-     * Bob <- Alice : bye
-     */
-    public void testIndexPageWithNoDefinedIndex() throws IOException {
-        try (final WebClient webClient = new WebClient()) {
-            HtmlPage page = webClient.getPage(
-                getServerUrl() + "/uml/" +
-                "SyfFKj2rKt3CoKnELR1Io4ZDoSddoaijBqXCJ-Lo0ahQwA99Eg7go4ajKIzMA4dCoKPNdfHQKf9Qf92NNuAknqQjA34ppquXgJ8Lbrr0AG00"
-            );
-            // Analyze response
-            List<HtmlForm> forms = page.getForms();
-            assertEquals(2, forms.size());
-            // Ensure the Text field is correct
-            String text = ((HtmlTextArea)(forms.get(0).getFirstByXPath("//textarea[contains(@name, 'text')]"))).getTextContent();
-            assertEquals(
-                "@startuml\nBob -> Alice : hello\nnewpage\nBob <- Alice : hello\nBob -> Alice : let's talk\nBob <- Alice : better not\nBob -> Alice : <&rain> bye\nnewpage\nBob <- Alice : bye\n@enduml",
-                text
-            );
-            // Ensure the URL field is correct
-            HtmlInput url = forms.get(1).getInputByName("url");
-            assertNotNull(url);
-            assertTrue(url.getAttribute("value").endsWith("/png/SyfFKj2rKt3CoKnELR1Io4ZDoSddoaijBqXCJ-Lo0ahQwA99Eg7go4ajKIzMA4dCoKPNdfHQKf9Qf92NNuAknqQjA34ppquXgJ8Lbrr0AG00"));
-            // Ensure the generated image is present
-            HtmlImage img = page.getFirstByXPath("//img[contains(@alt, 'PlantUML diagram')]");
-            int height = img.getImageReader().getHeight(0);
-            assertNotEquals(0, height);  // 132
-            assertNotEquals(0, img.getImageReader().getWidth(0));  // 152
-            // Ensure the correct index was generated
-            assertTrue(height > 100);  // 132
-            assertTrue(height < 150);  // 132
-        }
-    }
-
-}
--- a/src/test/java/net/sourceforge/plantuml/servlet/TestImage.java
+++ b/src/test/java/net/sourceforge/plantuml/servlet/TestImage.java
@ -8,6 +8,9 @@ import java.text.SimpleDateFormat;
 import java.util.Date;
 import java.util.Locale;

+import net.sourceforge.plantuml.servlet.utils.TestUtils;
+import net.sourceforge.plantuml.servlet.utils.WebappTestCase;
+

 public class TestImage extends WebappTestCase {

--- a/src/test/java/net/sourceforge/plantuml/servlet/TestLanguage.java
+++ b/src/test/java/net/sourceforge/plantuml/servlet/TestLanguage.java
@ -3,6 +3,8 @@ package net.sourceforge.plantuml.servlet;
 import java.io.IOException;
 import java.net.URL;

+import net.sourceforge.plantuml.servlet.utils.WebappTestCase;
+

 public class TestLanguage extends WebappTestCase {

--- a/src/test/java/net/sourceforge/plantuml/servlet/TestMap.java
+++ b/src/test/java/net/sourceforge/plantuml/servlet/TestMap.java
@ -4,6 +4,9 @@ import java.io.IOException;
 import java.net.URL;
 import java.net.URLConnection;

+import net.sourceforge.plantuml.servlet.utils.TestUtils;
+import net.sourceforge.plantuml.servlet.utils.WebappTestCase;
+

 public class TestMap extends WebappTestCase {

--- a/src/test/java/net/sourceforge/plantuml/servlet/TestSVG.java
+++ b/src/test/java/net/sourceforge/plantuml/servlet/TestSVG.java
@ -8,6 +8,9 @@ import java.net.URL;
 import java.net.URLConnection;
 import java.util.Scanner;

+import net.sourceforge.plantuml.servlet.utils.TestUtils;
+import net.sourceforge.plantuml.servlet.utils.WebappTestCase;
+

 public class TestSVG extends WebappTestCase {

--- a/src/test/java/net/sourceforge/plantuml/servlet/TestWebUI.java
+++ b/src/test/java/net/sourceforge/plantuml/servlet/TestWebUI.java
@ -0,0 +1,209 @@
+package net.sourceforge.plantuml.servlet;
+
+import static org.junit.Assert.assertNotEquals;
+
+import org.openqa.selenium.By;
+import org.openqa.selenium.Dimension;
+import org.openqa.selenium.WebElement;
+
+import net.sourceforge.plantuml.servlet.utils.TestUtils;
+import net.sourceforge.plantuml.servlet.utils.WebappUITestCase;
+
+
+public class TestWebUI extends WebappUITestCase {
+
+    /**
+     * Verifies that the welcome page has exactly two form with the Bob --> Alice sample
+     */
+    public void testWelcomePage() {
+        driver.get(getServerUrl());
+        assertTrue("UI loading completed", waitUntilUIIsLoaded());
+        // ensure the editor text is correct
+        String text = getEditorValue();
+        assertEquals(TestUtils.SEQBOBCODE, text);
+        // ensure the URL field is correct
+        String url = getURLValue();
+        assertTrue(url.endsWith("/png/" + TestUtils.SEQBOB));
+        // ensure the generated image is present
+        Dimension dim = getImageSize();
+        assertNotEquals(0, dim.getHeight());  // 145
+        assertNotEquals(0, dim.getWidth());   // 134
+    }
+
+    /**
+     * Verifies that the version image is generated
+     */
+    public void testVersion() {
+        driver.get(getServerUrl());
+        assertTrue("UI loading completed", waitUntilUIIsLoaded());
+        // change code and observe result
+        setEditorValue(TestUtils.VERSIONCODE);
+        assertTrue("Auto update done", waitUntilAutoRefreshCompleted());
+        // ensure the editor text is correct
+        String text = getEditorValue();
+        assertEquals(TestUtils.VERSIONCODE, text);
+        // ensure the URL field is correct
+        String url = getURLValue();
+        assertTrue(url.endsWith("/png/" + TestUtils.VERSION));
+        // ensure the generated image is present
+        Dimension dim = getImageSize();
+        assertNotEquals(0, dim.getHeight());  // 242
+        assertNotEquals(0, dim.getWidth());   // 472
+    }
+
+    // /**
+    //  * Verifies that when the UML text is empty, ...
+    //  * old behavior: default page and image is generated
+    //  */
+    // public void testEmptyText() {
+    //     // ...
+    // }
+
+    // /**
+    //  * Verifies that when the encoded URL is empty, ...
+    //  * old behavior: default page and image is generated
+    //  */
+    // public void testEmptyUrl() {
+    //     // ...
+    // }
+
+    /**
+     * Verifies that a ditaa diagram is generated
+     */
+    public void testDitaaText() {
+        driver.get(getServerUrl());
+        assertTrue("UI loading completed", waitUntilUIIsLoaded());
+        // change code and observe result
+        setEditorValue("@startditaa \n*--> \n@endditaa");
+        assertTrue("Auto update done", waitUntilAutoRefreshCompleted());
+        // ensure the editor text is correct
+        String text = getEditorValue();
+        assertEquals("@startditaa \n*--> \n@endditaa", text);
+        // ensure the URL field is correct
+        String url = getURLValue();
+        assertTrue(url.endsWith("/png/SoWkIImgISaiIKnKuDBIrRLJu798pKi12m00"));
+        // ensure the generated image is present
+        Dimension dim = getImageSize();
+        assertNotEquals(0, dim.getHeight());
+        assertNotEquals(0, dim.getWidth());
+    }
+
+    /**
+     * Verifies that an image map is produced if the diagram contains a link
+     */
+    public void testImageMap() {
+        driver.get(getServerUrl());
+        assertTrue("UI loading completed", waitUntilUIIsLoaded());
+        // change code and observe result
+        setEditorValue("@startuml\nBob -> Alice : [[http://yahoo.com]] Hello\n@enduml");
+        assertTrue("Auto update done", waitUntilAutoRefreshCompleted());
+        // ensure the editor text is correct
+        String text = getEditorValue();
+        assertEquals("@startuml\nBob -> Alice : [[http://yahoo.com]] Hello\n@enduml", text);
+        // ensure the URL field is correct
+        String url = getURLValue();
+        assertTrue(url.endsWith("/png/SyfFKj2rKt3CoKnELR1IY8xEA2afiDBNhqpCoC_NIyxFZOrLy4ZDoSa70000"));
+        // ensure the generated image is present
+        Dimension dim = getImageSize();
+        assertNotEquals(0, dim.getHeight());
+        assertNotEquals(0, dim.getWidth());
+        // ensure the image map is present
+        WebElement map = getImageMap();
+        assertNotNull(map);
+        assertEquals(1, Integer.parseInt(map.getAttribute("childElementCount")));
+        // ensure the map button is visible
+        WebElement btnMap = driver.findElement(By.id("map-diagram-link"));
+        assertTrue(btnMap.isDisplayed());
+    }
+
+    /**
+     * Verifies that when the encoded source is specified as an URL parameter
+     * the diagram is displayed and the source is decoded
+     */
+    public void testUrlParameter() {
+        driver.get(getServerUrl() + "/form?url=" + TestUtils.SEQBOB);
+        assertTrue("UI loading completed", waitUntilUIIsLoaded());
+        // ensure the editor text is correct
+        String text = getEditorValue();
+        assertEquals(TestUtils.SEQBOBCODE, text);
+        // ensure the URL field is correct
+        String url = getURLValue();
+        assertTrue(url.endsWith("/png/" + TestUtils.SEQBOB));
+        // ensure the generated image is present
+        Dimension dim = getImageSize();
+        assertNotEquals(0, dim.getHeight());
+        assertNotEquals(0, dim.getWidth());
+    }
+
+    /**
+     * Verifies that an multipage diagram renders correct given index.
+     *
+     * Bob -> Alice : hello
+     * newpage
+     * Bob <- Alice : hello
+     * Bob -> Alice : let's talk
+     * Bob <- Alice : better not
+     * Bob -> Alice : <&rain> bye
+     * newpage
+     * Bob <- Alice : bye
+     */
+    public void testIndexPage() {
+        driver.get(
+            getServerUrl() + "/uml/1/" +
+            "SyfFKj2rKt3CoKnELR1Io4ZDoSddoaijBqXCJ-Lo0ahQwA99Eg7go4ajKIzMA4dCoKPNdfHQKf9Qf92NNuAknqQjA34ppquXgJ8Lbrr0AG00"
+        );
+        assertTrue("UI loading completed", waitUntilUIIsLoaded());
+        // ensure the editor text is correct
+        String text = getEditorValue();
+        assertEquals(
+            "@startuml\nBob -> Alice : hello\nnewpage\nBob <- Alice : hello\nBob -> Alice : let's talk\nBob <- Alice : better not\nBob -> Alice : <&rain> bye\nnewpage\nBob <- Alice : bye\n@enduml",
+            text
+        );
+        // ensure the URL field is correct
+        String url = getURLValue();
+        assertTrue(url.endsWith("/png/1/SyfFKj2rKt3CoKnELR1Io4ZDoSddoaijBqXCJ-Lo0ahQwA99Eg7go4ajKIzMA4dCoKPNdfHQKf9Qf92NNuAknqQjA34ppquXgJ8Lbrr0AG00"));
+        // ensure the generated image is present
+        Dimension dim = getImageSize();
+        assertNotEquals(0, dim.getHeight());
+        assertNotEquals(0, dim.getWidth());
+        // ensure the correct index was generated
+        assertTrue(dim.getHeight() > 200);  // 222
+        assertTrue(dim.getHeight() < 250);  // 222
+    }
+
+    /**
+     * Verifies that an multipage diagram renders correct even if no index is specified.
+     *
+     * Bob -> Alice : hello
+     * newpage
+     * Bob <- Alice : hello
+     * Bob -> Alice : let's talk
+     * Bob <- Alice : better not
+     * Bob -> Alice : <&rain> bye
+     * newpage
+     * Bob <- Alice : bye
+     */
+    public void testIndexPageWithNoDefinedIndex() {
+        driver.get(
+            getServerUrl() + "/uml/" +
+            "SyfFKj2rKt3CoKnELR1Io4ZDoSddoaijBqXCJ-Lo0ahQwA99Eg7go4ajKIzMA4dCoKPNdfHQKf9Qf92NNuAknqQjA34ppquXgJ8Lbrr0AG00"
+        );
+        assertTrue("UI loading completed", waitUntilUIIsLoaded());
+        // ensure the editor text is correct
+        String text = getEditorValue();
+        assertEquals(
+            "@startuml\nBob -> Alice : hello\nnewpage\nBob <- Alice : hello\nBob -> Alice : let's talk\nBob <- Alice : better not\nBob -> Alice : <&rain> bye\nnewpage\nBob <- Alice : bye\n@enduml",
+            text
+        );
+        // ensure the URL field is correct
+        String url = getURLValue();
+        assertTrue(url.endsWith("/png/SyfFKj2rKt3CoKnELR1Io4ZDoSddoaijBqXCJ-Lo0ahQwA99Eg7go4ajKIzMA4dCoKPNdfHQKf9Qf92NNuAknqQjA34ppquXgJ8Lbrr0AG00"));
+        // ensure the generated image is present
+        Dimension dim = getImageSize();
+        assertNotEquals(0, dim.getHeight());
+        assertNotEquals(0, dim.getWidth());
+        // ensure the correct index was generated
+        assertTrue(dim.getHeight() > 100);  // 132
+        assertTrue(dim.getHeight() < 150);  // 132
+    }
+}
--- a/src/test/java/net/sourceforge/plantuml/servlet/utils/JUnitWebDriver.java
+++ b/src/test/java/net/sourceforge/plantuml/servlet/utils/JUnitWebDriver.java
@ -0,0 +1,79 @@
+package net.sourceforge.plantuml.servlet.utils;
+
+import java.time.Duration;
+
+import org.apache.commons.lang3.SystemUtils;
+import org.openqa.selenium.Dimension;
+import org.openqa.selenium.PageLoadStrategy;
+import org.openqa.selenium.Point;
+import org.openqa.selenium.WebDriver;
+import org.openqa.selenium.chrome.ChromeDriver;
+import org.openqa.selenium.chrome.ChromeOptions;
+import org.openqa.selenium.edge.EdgeDriver;
+import org.openqa.selenium.edge.EdgeOptions;
+import org.openqa.selenium.firefox.FirefoxDriver;
+import org.openqa.selenium.firefox.FirefoxOptions;
+
+import io.github.bonigarcia.wdm.WebDriverManager;
+
+
+public abstract class JUnitWebDriver {
+
+    public static final String browser;
+
+    static {
+        browser = System.getProperty("system.test.browser", "firefox");
+    }
+
+    public static WebDriver getDriver() {
+        WebDriver driver;
+        switch (browser.toLowerCase()) {
+            case "chrome":
+                driver = getChromeDriver();
+                break;
+            case "edge":
+                driver = SystemUtils.IS_OS_WINDOWS ? getEdgeDriver() : getChromiumDriver();
+                break;
+            case "firefox":
+                driver = getFirefoxDriver();
+                break;
+            default:
+                driver = getChromiumDriver();
+        }
+        driver.manage().timeouts().implicitlyWait(Duration.ofSeconds(5));
+        driver.manage().timeouts().pageLoadTimeout(Duration.ofSeconds(10));
+        driver.manage().window().setPosition(new Point(0, 0));
+        driver.manage().window().setSize(new Dimension(1024, 768));
+        return driver;
+    }
+
+    private static WebDriver getChromiumDriver() {
+        WebDriverManager.chromiumdriver().setup();
+        ChromeOptions options = new ChromeOptions();
+        options.addArguments("--headless", "--no-sandbox", "--disable-gpu");
+        options.setPageLoadStrategy(PageLoadStrategy.NONE);
+        return new ChromeDriver(options);
+    }
+
+    private static WebDriver getChromeDriver() {
+        WebDriverManager.chromedriver().setup();
+        ChromeOptions options = new ChromeOptions();
+        options.addArguments("--headless", "--no-sandbox", "--disable-gpu");
+        options.setPageLoadStrategy(PageLoadStrategy.NONE);
+        return new ChromeDriver(options);
+    }
+
+    private static WebDriver getFirefoxDriver() {
+        WebDriverManager.firefoxdriver().setup();
+        FirefoxOptions options = new FirefoxOptions();
+        options.addArguments("--headless");
+        return new FirefoxDriver(options);
+    }
+
+    private static WebDriver getEdgeDriver() {
+        WebDriverManager.edgedriver().setup();
+        EdgeOptions options = new EdgeOptions();
+        options.addArguments("headless");
+        return new EdgeDriver(options);
+    }
+}
--- a/src/test/java/net/sourceforge/plantuml/servlet/utils/TestUtils.java
+++ b/src/test/java/net/sourceforge/plantuml/servlet/utils/TestUtils.java
@ -1,4 +1,4 @@
-package net.sourceforge.plantuml.servlet;
+package net.sourceforge.plantuml.servlet.utils;


 /**
--- a/src/test/java/net/sourceforge/plantuml/servlet/utils/WebappTestCase.java
+++ b/src/test/java/net/sourceforge/plantuml/servlet/utils/WebappTestCase.java
@ -1,4 +1,4 @@
-package net.sourceforge.plantuml.servlet;
+package net.sourceforge.plantuml.servlet.utils;

 import java.io.BufferedReader;
 import java.io.ByteArrayOutputStream;
@ -9,6 +9,7 @@ import java.net.URL;
 import java.net.URLConnection;

 import junit.framework.TestCase;
+
 import net.sourceforge.plantuml.servlet.server.EmbeddedJettyServer;
 import net.sourceforge.plantuml.servlet.server.ExternalServer;
 import net.sourceforge.plantuml.servlet.server.ServerUtils;
@ -23,27 +24,19 @@ public abstract class WebappTestCase extends TestCase {
    }

    public WebappTestCase(String name) {
-        super(name);
-        // logger = LoggerFactory.getLogger(this.getClass());
-
        String uri = System.getProperty("system.test.server", "");
-        //uri = "http://localhost:8080/plantuml";
        if (!uri.isEmpty()) {
            // mvn test -DskipTests=false -DargLine="-Dsystem.test.server=http://localhost:8080/plantuml"
-            // logger.info("Test against external server: " + uri);
            serverUtils = new ExternalServer(uri);
            return;
        }
-
        // mvn test -DskipTests=false
-        // logger.info("Test against embedded jetty server.");
        serverUtils = new EmbeddedJettyServer();
    }

    @Override
    public void setUp() throws Exception {
        serverUtils.startServer();
-        // logger.info(getServerUrl());
    }

    @Override
@ -51,7 +44,7 @@ public abstract class WebappTestCase extends TestCase {
        serverUtils.stopServer();
    }

-    protected String getServerUrl() {
+    public String getServerUrl() {
        return serverUtils.getServerUrl();
    }

@ -104,5 +97,4 @@ public abstract class WebappTestCase extends TestCase {
            return byteStream.toByteArray();
        }
    }
-
 }
--- a/src/test/java/net/sourceforge/plantuml/servlet/utils/WebappUITestCase.java
+++ b/src/test/java/net/sourceforge/plantuml/servlet/utils/WebappUITestCase.java
@ -0,0 +1,90 @@
+package net.sourceforge.plantuml.servlet.utils;
+
+import java.time.Duration;
+
+import org.openqa.selenium.By;
+import org.openqa.selenium.Dimension;
+import org.openqa.selenium.JavascriptExecutor;
+import org.openqa.selenium.WebDriver;
+import org.openqa.selenium.WebElement;
+import org.openqa.selenium.support.ui.ExpectedCondition;
+import org.openqa.selenium.support.ui.WebDriverWait;
+
+
+public abstract class WebappUITestCase extends WebappTestCase {
+
+    public WebDriver driver;
+    public JavascriptExecutor js;
+
+    @Override
+    public void setUp() throws Exception {
+        super.setUp();
+        driver = JUnitWebDriver.getDriver();
+        js = (JavascriptExecutor)driver;
+    }
+
+    @Override
+    public void tearDown() throws Exception {
+        driver.close();
+        super.tearDown();
+    }
+
+    public boolean waitUntilJavascriptIsLoaded() {
+        WebDriverWait wait = new WebDriverWait(driver, Duration.ofSeconds(30));
+        return wait.until(new ExpectedCondition<Boolean>() {
+            @Override
+            public Boolean apply(WebDriver driver) {
+                return js.executeScript("return document.readyState").toString().equals("complete");
+            }
+        });
+    }
+
+    public boolean waitUntilEditorIsLoaded() {
+        WebDriverWait wait = new WebDriverWait(driver, Duration.ofSeconds(30));
+        return wait.until(new ExpectedCondition<Boolean>() {
+            @Override
+            public Boolean apply(WebDriver driver) {
+                return js.executeScript("return document.editor === undefined").toString().equals("false");
+            }
+        });
+    }
+
+    public boolean waitUntilAutoRefreshCompleted() {
+        WebDriverWait wait = new WebDriverWait(driver, Duration.ofSeconds(10));
+        return wait.until(new ExpectedCondition<Boolean>() {
+            @Override
+            public Boolean apply(WebDriver driver) {
+                return js.executeScript("return document.appConfig.autoRefreshState").toString().equals("complete");
+            }
+        });
+    }
+
+    public boolean waitUntilUIIsLoaded() {
+        return waitUntilEditorIsLoaded();
+    }
+
+    public String getEditorValue() {
+        return (String)js.executeScript("return document.editor.getValue();");
+    }
+
+    public void setEditorValue(String code) {
+        js.executeScript("return document.editor.getModel().setValue(`" + code.replace("`", "\\`") + "`);");
+    }
+
+    public String getURLValue() {
+        return driver.findElement(By.id("url")).getAttribute("value");
+    }
+
+    public Dimension getImageSize() {
+        WebElement img = driver.findElement(By.id("diagram-png"));
+        return new Dimension(
+            Integer.parseInt(img.getAttribute("width")),
+            Integer.parseInt(img.getAttribute("height"))
+        );
+        // return driver.findElement(By.id("diagram-png")).getSize();
+    }
+
+    public WebElement getImageMap() {
+        return driver.findElement(By.id("plantuml_map"));
+    }
+}
				`@ -0,0 +1 @@`
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				`@ -0,0 +1 @@`
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				`@ -0,0 +1 @@`
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				`@ -0,0 +1 @@`
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				`@ -0,0 +1 @@`
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				`@ -0,0 +1 @@`
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