plantuml-server/src/main/webapp/components/editor/url-input/editor-url-input.jsp

<div class="btn-input">
  <input id="url" type="text" name="url" value="png/<%= diagramUrl %>" />
  <input id="url-copy-btn" type="image" alt="copy" src="assets/actions/copy.svg" tabindex="-1" />
</div>