diff --git a/packages/utils/package-lock.json b/packages/utils/package-lock.json
index 9da4729..50d5b6d 100644
--- a/packages/utils/package-lock.json
+++ b/packages/utils/package-lock.json
@@ -17,6 +17,7 @@
 				"local-pkg": "^0.4.0"
 			},
 			"devDependencies": {
+				"@iconify-json/flat-color-icons": "^1.0.2",
 				"@iconify/library-builder": "^1.0.5",
 				"@types/debug": "^4.1.7",
 				"@types/jest": "^27.0.1",
@@ -740,6 +741,15 @@
 			"integrity": "sha512-wdppn25U8z/2yiaT6YGquE6X8sSv7hNMWSXYSSU1jGv/yd6XqjXgTDJ8KP4NgjTXfJ3GbRjeeb8RTV7a/VpM+w==",
 			"dev": true
 		},
+		"node_modules/@iconify-json/flat-color-icons": {
+			"version": "1.1.0",
+			"resolved": "https://registry.npmjs.org/@iconify-json/flat-color-icons/-/flat-color-icons-1.1.0.tgz",
+			"integrity": "sha512-UWbgi+4T0wkOQHNKxfxfGiDevGPrgD369kzC/dHGaz6WJxlwqxxRQvb6L8tTVCLdwIcmcNCV1Wy0SKgX0R/pHw==",
+			"dev": true,
+			"dependencies": {
+				"@iconify/types": "^1.0.12"
+			}
+		},
 		"node_modules/@iconify/library-builder": {
 			"version": "1.0.5",
 			"resolved": "https://registry.npmjs.org/@iconify/library-builder/-/library-builder-1.0.5.tgz",
@@ -5951,6 +5961,15 @@
 			"integrity": "sha512-wdppn25U8z/2yiaT6YGquE6X8sSv7hNMWSXYSSU1jGv/yd6XqjXgTDJ8KP4NgjTXfJ3GbRjeeb8RTV7a/VpM+w==",
 			"dev": true
 		},
+		"@iconify-json/flat-color-icons": {
+			"version": "1.1.0",
+			"resolved": "https://registry.npmjs.org/@iconify-json/flat-color-icons/-/flat-color-icons-1.1.0.tgz",
+			"integrity": "sha512-UWbgi+4T0wkOQHNKxfxfGiDevGPrgD369kzC/dHGaz6WJxlwqxxRQvb6L8tTVCLdwIcmcNCV1Wy0SKgX0R/pHw==",
+			"dev": true,
+			"requires": {
+				"@iconify/types": "^1.0.12"
+			}
+		},
 		"@iconify/library-builder": {
 			"version": "1.0.5",
 			"resolved": "https://registry.npmjs.org/@iconify/library-builder/-/library-builder-1.0.5.tgz",
diff --git a/packages/utils/package.json b/packages/utils/package.json
index b3bfbe3..0ced1a3 100644
--- a/packages/utils/package.json
+++ b/packages/utils/package.json
@@ -124,6 +124,18 @@
 			"require": "./lib/loader/custom.js",
 			"import": "./lib/loader/custom.mjs"
 		},
+		"./lib/loader/fs": {
+			"require": "./lib/loader/fs.js",
+			"import": "./lib/loader/fs.mjs"
+		},
+		"./lib/loader/install-pkg": {
+			"require": "./lib/loader/install-pkg.js",
+			"import": "./lib/loader/install-pkg.mjs"
+		},
+		"./lib/loader/loader": {
+			"require": "./lib/loader/loader.js",
+			"import": "./lib/loader/loader.mjs"
+		},
 		"./lib/loader/loaders": {
 			"require": "./lib/loader/loaders.js",
 			"import": "./lib/loader/loaders.mjs"
@@ -148,6 +160,10 @@
 			"require": "./lib/svg/build.js",
 			"import": "./lib/svg/build.mjs"
 		},
+		"./lib/svg/encode-svg-for-css": {
+			"require": "./lib/svg/encode-svg-for-css.js",
+			"import": "./lib/svg/encode-svg-for-css.mjs"
+		},
 		"./lib/svg/id": {
 			"require": "./lib/svg/id.js",
 			"import": "./lib/svg/id.mjs"
@@ -166,6 +182,7 @@
 		"local-pkg": "^0.4.0"
 	},
 	"devDependencies": {
+		"@iconify-json/flat-color-icons": "^1.0.2",
 		"@iconify/library-builder": "^1.0.5",
 		"@types/debug": "^4.1.7",
 		"@types/jest": "^27.0.1",
diff --git a/packages/utils/src/index.ts b/packages/utils/src/index.ts
index 495ae24..badee3e 100644
--- a/packages/utils/src/index.ts
+++ b/packages/utils/src/index.ts
@@ -39,6 +39,7 @@ export { convertIconSetInfo } from './icon-set/convert-info';
 export { iconToSVG } from './svg/build';
 export { replaceIDs } from './svg/id';
 export { calculateSize } from './svg/size';
+export { encodeSvgForCss } from './svg/encode-svg-for-css';
 
 // Colors
 export { colorKeywords } from './colors/keywords';
@@ -50,12 +51,14 @@ export type {
 	CustomCollections,
 	IconCustomizer,
 	IconCustomizations,
+	IconifyLoaderOptions,
 	InlineCollection,
 } from './loader/types';
-export { tryInstallPkg, mergeIconProps } from './loader/utils';
+export { mergeIconProps } from './loader/utils';
+export { isNode, loadIcon } from './loader/loader';
 export { FileSystemIconLoader } from './loader/loaders';
 export { getCustomIcon } from './loader/custom';
-export { loadCollection, searchForIcon } from './loader/modern';
+export { searchForIcon } from './loader/modern';
 
 // Misc
 export { camelize, camelToKebab, pascalize } from './misc/strings';
diff --git a/packages/utils/src/loader/custom.ts b/packages/utils/src/loader/custom.ts
index 84e3ed4..321a6c2 100644
--- a/packages/utils/src/loader/custom.ts
+++ b/packages/utils/src/loader/custom.ts
@@ -1,9 +1,5 @@
 import createDebugger from 'debug';
-import type {
-	CustomIconLoader,
-	IconCustomizations,
-	InlineCollection,
-} from './types';
+import type { CustomIconLoader, IconifyLoaderOptions, InlineCollection } from './types';
 import { mergeIconProps } from './utils';
 
 const debug = createDebugger('@iconify-loader:custom');
@@ -15,7 +11,7 @@ export async function getCustomIcon(
 	custom: CustomIconLoader | InlineCollection,
 	collection: string,
 	icon: string,
-	iconsCustomizations?: IconCustomizations
+	options?: IconifyLoaderOptions,
 ): Promise<string | undefined> {
 	let result: string | undefined | null;
 
@@ -29,24 +25,19 @@ export async function getCustomIcon(
 	}
 
 	if (result) {
-		if (!result.startsWith('<svg ')) {
+		if (!result.startsWith('<svg')) {
 			console.warn(
 				`Custom icon "${icon}" in "${collection}" is not a valid SVG`
 			);
 			return result;
 		}
-		const {
-			transform,
-			additionalProps = {},
-			iconCustomizer,
-		} = iconsCustomizations || {};
+		const { transform } = options?.customizations ?? {};
 		return await mergeIconProps(
-			transform ? await transform(result) : result,
+			typeof transform === 'function' ? await transform(result) : result,
 			collection,
 			icon,
-			additionalProps,
+			options,
 			undefined,
-			iconCustomizer
 		);
 	}
 }
diff --git a/packages/utils/src/loader/fs.ts b/packages/utils/src/loader/fs.ts
new file mode 100644
index 0000000..50a12f5
--- /dev/null
+++ b/packages/utils/src/loader/fs.ts
@@ -0,0 +1,39 @@
+import { promises as fs, Stats } from 'fs';
+import { isPackageExists, resolveModule } from 'local-pkg'
+import type { IconifyJSON } from '@iconify/types'
+import { tryInstallPkg } from './install-pkg';
+
+const _collections: Record<string, Promise<IconifyJSON | undefined>> = {};
+const isLegacyExists = isPackageExists('@iconify/json');
+
+export async function loadCollectionFromFS(name: string, autoInstall = false): Promise<IconifyJSON | undefined> {
+	if (!_collections[name]) {
+		_collections[name] = task();
+	}
+	return _collections[name];
+
+	async function task() {
+		let jsonPath = resolveModule(`@iconify-json/${name}/icons.json`);
+		if (!jsonPath && isLegacyExists) {
+			jsonPath = resolveModule(`@iconify/json/json/${name}.json`);
+		}
+
+		if (!jsonPath && !isLegacyExists && autoInstall) {
+			await tryInstallPkg(`@iconify-json/${name}`);
+			jsonPath = resolveModule(`@iconify-json/${name}/icons.json`);
+		}
+
+		let stat: Stats | undefined;
+		try {
+			stat = jsonPath ? await fs.lstat(jsonPath) : undefined;
+		} catch (err) {
+			return undefined;
+		}
+		if (stat && stat.isFile()) {
+			return JSON.parse(await fs.readFile(jsonPath as string, 'utf8')) as IconifyJSON;
+		}
+		else {
+			return undefined;
+		}
+	}
+}
diff --git a/packages/utils/src/loader/install-pkg.ts b/packages/utils/src/loader/install-pkg.ts
new file mode 100644
index 0000000..282b1e9
--- /dev/null
+++ b/packages/utils/src/loader/install-pkg.ts
@@ -0,0 +1,42 @@
+import { installPackage } from '@antfu/install-pkg';
+import { sleep } from '@antfu/utils';
+import { cyan, yellow } from 'kolorist';
+
+const warned = new Set<string>();
+
+export function warnOnce(msg: string): void {
+	if (!warned.has(msg)) {
+		warned.add(msg);
+		console.warn(yellow(`[@iconify-loader] ${msg}`));
+	}
+}
+
+let pending: Promise<void> | undefined;
+const tasks: Record<string, Promise<void> | undefined> = {};
+
+export async function tryInstallPkg(name: string): Promise<void | undefined> {
+	if (pending) {
+		await pending;
+	}
+
+	if (!tasks[name]) {
+		// eslint-disable-next-line no-console
+		console.log(cyan(`Installing ${name}...`));
+		tasks[name] = pending = installPackage(name, {
+			dev: true,
+			preferOffline: true,
+		})
+			.then(() => sleep(300))
+			// eslint-disable-next-line
+			.catch((e: any) => {
+				warnOnce(`Failed to install ${name}`);
+				console.error(e);
+			})
+			.finally(() => {
+				pending = undefined;
+			});
+	}
+
+	// eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+	return tasks[name]!;
+}
diff --git a/packages/utils/src/loader/loader.ts b/packages/utils/src/loader/loader.ts
new file mode 100644
index 0000000..830a799
--- /dev/null
+++ b/packages/utils/src/loader/loader.ts
@@ -0,0 +1,67 @@
+import { getCustomIcon } from './custom';
+import { searchForIcon } from './modern';
+import { warnOnce } from './install-pkg';
+import type { IconifyLoaderOptions } from './types';
+
+export const isNode = typeof process < 'u' && typeof process.stdout < 'u'
+
+export async function loadIcon(
+	collection: string,
+	icon: string,
+	options?: IconifyLoaderOptions
+): Promise<string | undefined> {
+	const custom = options?.customCollections?.[collection];
+
+	if (custom) {
+		const result = await getCustomIcon(custom, collection, icon, options);
+		if (result) {
+			return result;
+		}
+	}
+
+	if (!isNode) {
+		return undefined;
+	}
+
+	return await loadNodeBuiltinIcon(collection, icon, options);
+}
+
+async function importFsModule(): Promise<typeof import('./fs') | undefined> {
+	try {
+		return await import('./fs');
+	} catch {
+		try {
+			// cjs environments
+			return require('./fs.js');
+		}
+		catch {
+			return undefined;
+		}
+	}
+}
+
+async function loadNodeBuiltinIcon(
+	collection: string,
+	icon: string,
+	options?: IconifyLoaderOptions,
+	warn = true,
+): Promise<string | undefined> {
+	// eslint-disable-next-line @typescript-eslint/ban-ts-comment
+	// @ts-ignore
+	const { loadCollectionFromFS } = await importFsModule();
+	const iconSet = await loadCollectionFromFS(collection, options?.autoInstall);
+	if (iconSet) {
+		// possible icon names
+		const ids = [
+			icon,
+			icon.replace(/([a-z])([A-Z])/g, '$1-$2').toLowerCase(),
+			icon.replace(/([a-z])(\d+)/g, '$1-$2'),
+		];
+		return await searchForIcon(iconSet, collection, ids, options);
+	}
+
+	if (warn) {
+		warnOnce(`failed to load \`@iconify-json/${collection}\`, have you installed it?`);
+	}
+}
+
diff --git a/packages/utils/src/loader/modern.ts b/packages/utils/src/loader/modern.ts
index de9983a..a5b5f51 100644
--- a/packages/utils/src/loader/modern.ts
+++ b/packages/utils/src/loader/modern.ts
@@ -1,70 +1,22 @@
-import { promises as fs } from 'fs';
 import type { IconifyJSON } from '@iconify/types';
 import type { FullIconifyIcon } from '../icon';
 import { iconToSVG } from '../svg/build';
 import { getIconData } from '../icon-set/get-icon';
-import { mergeIconProps, tryInstallPkg } from './utils';
+import { mergeIconProps } from './utils';
 import createDebugger from 'debug';
-import { isPackageExists, resolveModule } from 'local-pkg';
 import { defaults as DefaultIconCustomizations } from '../customisations';
-import type { IconCustomizations } from './types';
+import type { IconifyLoaderOptions } from './types';
 
 const debug = createDebugger('@iconify-loader:icon');
-const debugModern = createDebugger('@iconify-loader:modern');
-const debugLegacy = createDebugger('@iconify-loader:legacy');
-
-const _collections: Record<string, Promise<IconifyJSON | undefined>> = {};
-const isLegacyExists = isPackageExists('@iconify/json');
-
-export async function loadCollection(
-	name: string,
-	autoInstall = false
-): Promise<IconifyJSON | undefined> {
-	if (!_collections[name]) {
-		_collections[name] = task();
-	}
-
-	return _collections[name];
-
-	async function task(): Promise<IconifyJSON | undefined> {
-		let jsonPath = resolveModule(`@iconify-json/${name}/icons.json`);
-		if (jsonPath) {
-			debugModern(name);
-		}
-
-		if (!jsonPath && isLegacyExists) {
-			jsonPath = resolveModule(`@iconify/json/json/${name}.json`);
-			if (jsonPath) {
-				debugLegacy(name);
-			}
-		}
-
-		if (!jsonPath && !isLegacyExists && autoInstall) {
-			await tryInstallPkg(`@iconify-json/${name}`);
-			jsonPath = resolveModule(`@iconify-json/${name}/icons.json`);
-		}
-
-		if (jsonPath) {
-			return JSON.parse(await fs.readFile(jsonPath, 'utf8'));
-		} else {
-			debugModern(`failed to load ${name}`);
-			return undefined;
-		}
-	}
-}
 
 export async function searchForIcon(
 	iconSet: IconifyJSON,
 	collection: string,
 	ids: string[],
-	iconCustomizations?: IconCustomizations
+	options?: IconifyLoaderOptions,
 ): Promise<string | undefined> {
 	let iconData: FullIconifyIcon | null;
-	const {
-		customize,
-		additionalProps = {},
-		iconCustomizer,
-	} = iconCustomizations || {};
+	const { customize } = options?.customizations ?? {};
 	for (const id of ids) {
 		iconData = getIconData(iconSet, id, true);
 		if (iconData) {
@@ -77,12 +29,12 @@ export async function searchForIcon(
 					: defaultCustomizations
 			);
 			return await mergeIconProps(
-				`<svg>${body}</svg>`,
+				// DON'T remove space on <svg >
+				`<svg >${body}</svg>`,
 				collection,
 				id,
-				additionalProps,
+				options,
 				() => attributes,
-				iconCustomizer
 			);
 		}
 	}
diff --git a/packages/utils/src/loader/types.ts b/packages/utils/src/loader/types.ts
index 5784f3d..ce0018c 100644
--- a/packages/utils/src/loader/types.ts
+++ b/packages/utils/src/loader/types.ts
@@ -56,7 +56,7 @@ export type IconCustomizations = {
 };
 
 /**
- * List of icons as object. Key is icon name, value is icon data or callback (can be async) to get icon data
+ * List of icons as object. Key is the icon name, the value is the icon data or callback (can be async) to get icon data
  */
 export type InlineCollection = Record<
 	string,
@@ -64,9 +64,59 @@ export type InlineCollection = Record<
 >;
 
 /**
- * Collection of custom icons. Key is collection name, value is loader or InlineCollection object
+ * Collection of custom icons. Key is the collection name, the value is the loader or InlineCollection object
  */
 export type CustomCollections = Record<
 	string,
 	CustomIconLoader | InlineCollection
 >;
+
+/**
+ * Options to use with the modern loader.
+ */
+export type IconifyLoaderOptions = {
+	/**
+	 * Add svg and xlink xml namespace when necessary.
+	 *
+	 * @default false
+	 */
+	addXmlNs?: boolean
+
+	/**
+	 * Scale of icons against 1em
+	 */
+	scale?: number
+
+	/**
+	 * Style to apply to icons by default
+	 *
+	 * @default ''
+	 */
+	defaultStyle?: string
+
+	/**
+	 * Class names to apply to icons by default
+	 *
+	 * @default ''
+	 */
+	defaultClass?: string
+
+	/**
+	 * Loader for custom loaders
+	 */
+	customCollections?: Record<string, CustomIconLoader | InlineCollection>
+
+	/**
+	 * Icon customizer
+	 */
+	customizations?: IconCustomizations
+
+	/**
+	 * Auto install icon sources package when the usages is detected
+	 *
+	 * **WARNING**: only on `node` environment, on `browser` this option will be ignored
+	 *
+	 * @default false
+	 */
+	autoInstall?: boolean
+}
diff --git a/packages/utils/src/loader/utils.ts b/packages/utils/src/loader/utils.ts
index 8caf7aa..fec837b 100644
--- a/packages/utils/src/loader/utils.ts
+++ b/packages/utils/src/loader/utils.ts
@@ -1,66 +1,59 @@
-import { installPackage } from '@antfu/install-pkg';
-import { Awaitable, sleep } from '@antfu/utils';
-import { cyan, yellow } from 'kolorist';
-import type { IconCustomizer } from './types';
-
-const warned = new Set<string>();
-
-export function warnOnce(msg: string): void {
-	if (!warned.has(msg)) {
-		warned.add(msg);
-		console.warn(yellow(`[@iconify-loader] ${msg}`));
-	}
-}
-
-let pending: Promise<void> | undefined;
-const tasks: Record<string, Promise<void> | undefined> = {};
+import type { Awaitable } from '@antfu/utils';
+import type { IconifyLoaderOptions } from './types';
 
 export async function mergeIconProps(
 	svg: string,
 	collection: string,
 	icon: string,
-	additionalProps: Record<string, string | undefined>,
+	options?: IconifyLoaderOptions,
 	propsProvider?: () => Awaitable<Record<string, string>>,
-	iconCustomizer?: IconCustomizer
 ): Promise<string> {
+	const { scale, addXmlNs = false } = options ?? {}
+	const {
+		additionalProps = {},
+		iconCustomizer,
+	} = options?.customizations ?? {};
 	const props: Record<string, string> = (await propsProvider?.()) ?? {};
+	if (!svg.includes(" width=") && !svg.includes(" height=") && typeof scale === 'number') {
+		if ((typeof props.width === 'undefined' || props.width === null) && (typeof props.height === 'undefined' || props.height === null)) {
+			props.width = `${scale}em`;
+			props.height = `${scale}em`;
+		}
+	}
+
 	await iconCustomizer?.(collection, icon, props);
 	Object.keys(additionalProps).forEach((p) => {
 		const v = additionalProps[p];
 		if (v !== undefined && v !== null) props[p] = v;
 	});
-	const replacement = svg.startsWith('<svg ') ? '<svg ' : '<svg';
-	return svg.replace(
-		replacement,
-		`${replacement}${Object.keys(props)
-			.map((p) => `${p}="${props[p]}"`)
-			.join(' ')}`
+	// add xml namespaces if necessary
+	if (addXmlNs) {
+		// add svg xmlns if missing
+		if (!svg.includes(' xmlns=') && !props['xmlns']) {
+			props['xmlns'] = 'http://www.w3.org/2000/svg';
+		}
+		// add xmlns:xlink if xlink present and the xmlns missing
+		if (!svg.includes(' xmlns:xlink=') && svg.includes('xlink:') && !props['xmlns:xlink']) {
+			props['xmlns:xlink'] = 'http://www.w3.org/1999/xlink';
+		}
+	}
+
+	svg = svg.replace(
+		'<svg ',
+		`<svg ${Object.keys(props).map((p) => `${p}="${props[p]}"`).join(' ')}`
 	);
-}
 
-export async function tryInstallPkg(name: string): Promise<void | undefined> {
-	if (pending) {
-		await pending;
+	if (svg && options) {
+		const { defaultStyle, defaultClass } = options
+		// additional props and iconCustomizer takes precedence
+		if (defaultClass && !svg.includes(' class=')) {
+			svg = svg.replace('<svg ', `<svg class="${defaultClass}" `);
+		}
+		// additional props and iconCustomizer takes precedence
+		if (defaultStyle && !svg.includes(' style=')) {
+			svg = svg.replace('<svg ', `<svg style="${defaultStyle}" `);
+		}
 	}
 
-	if (!tasks[name]) {
-		// eslint-disable-next-line no-console
-		console.log(cyan(`Installing ${name}...`));
-		tasks[name] = pending = installPackage(name, {
-			dev: true,
-			preferOffline: true,
-		})
-			.then(() => sleep(300))
-			// eslint-disable-next-line
-			.catch((e: any) => {
-				warnOnce(`Failed to install ${name}`);
-				console.error(e);
-			})
-			.finally(() => {
-				pending = undefined;
-			});
-	}
-
-	// eslint-disable-next-line @typescript-eslint/no-non-null-assertion
-	return tasks[name]!;
+	return svg;
 }
diff --git a/packages/utils/src/svg/encode-svg-for-css.ts b/packages/utils/src/svg/encode-svg-for-css.ts
new file mode 100644
index 0000000..845e549
--- /dev/null
+++ b/packages/utils/src/svg/encode-svg-for-css.ts
@@ -0,0 +1,17 @@
+// https://bl.ocks.org/jennyknuth/222825e315d45a738ed9d6e04c7a88d0
+export function encodeSvgForCss(svg: string): string {
+	let useSvg = svg.startsWith('<svg>') ? svg.replace('<svg>', '<svg >') : svg;
+	if (!useSvg.includes(' xmlns:xlink=') && useSvg.includes(' xlink:')) {
+		useSvg = useSvg.replace('<svg ', '<svg xmlns:xlink="http://www.w3.org/1999/xlink" ');
+	}
+	if (!useSvg.includes(' xmlns=')) {
+		useSvg = useSvg.replace('<svg ', '<svg xmlns="http://www.w3.org/2000/svg" ');
+	}
+	return useSvg.replace(/"/g, '\'')
+		.replace(/%/g, '%25')
+		.replace(/#/g, '%23')
+		.replace(/{/g, '%7B')
+		.replace(/}/g, '%7D')
+		.replace(/</g, '%3C')
+		.replace(/>/g, '%3E');
+}
diff --git a/packages/utils/tests/get-custom-icon-test.ts b/packages/utils/tests/get-custom-icon-test.ts
index f2ae0fe..bbf43cb 100644
--- a/packages/utils/tests/get-custom-icon-test.ts
+++ b/packages/utils/tests/get-custom-icon-test.ts
@@ -13,9 +13,11 @@ describe('Testing getCustomIcon', () => {
 	test('CustomIconLoader with transform', async () => {
 		const svg = await fs.readFile(fixturesDir + '/circle.svg', 'utf8');
 		const result = await getCustomIcon(() => svg, 'a', 'b', {
-			transform(icon) {
-				return icon.replace('<svg ', '<svg width="1em" height="1em" ');
-			},
+			customizations: {
+				transform(icon) {
+					return icon.replace('<svg ', '<svg width="1em" height="1em" ');
+				},
+			}
 		});
 		expect(result && result.indexOf('width="1em"') > -1).toBeTruthy();
 		expect(result && result.indexOf('height="1em"') > -1).toBeTruthy();
diff --git a/packages/utils/tests/iconify-icon-test.ts b/packages/utils/tests/iconify-icon-test.ts
new file mode 100644
index 0000000..75a284a
--- /dev/null
+++ b/packages/utils/tests/iconify-icon-test.ts
@@ -0,0 +1,59 @@
+import { loadIcon } from '../lib';
+
+describe('Testing loadIcon with @iconify-json/flat-color-icons>', () => {
+
+	test('loadIcon works', async () => {
+		const result = await loadIcon('flat-color-icons', 'up-right');
+		expect(result).toBeTruthy();
+	});
+
+	test('loadIcon adds xmlns:xlink', async () => {
+		const result = await loadIcon('flat-color-icons', 'up-right', { addXmlNs: true });
+		expect(result).toBeTruthy();
+		expect(result && result.indexOf('xmlns:xlink=') > - 1).toBeTruthy();
+	});
+
+	test('loadIcon with customize with default style and class', async () => {
+		const result = await loadIcon('flat-color-icons', 'up-right', {
+			defaultStyle: 'margin-top: 1rem;',
+			defaultClass: 'clazz',
+			customizations: {
+				customize(props) {
+					props.width = '2em';
+					props.height = '2em';
+					return props;
+				},
+			}
+		});
+		expect(result).toBeTruthy();
+		expect(result && result.indexOf('margin-top: 1rem;') > - 1).toBeTruthy();
+		expect(result && result.indexOf('class="clazz"') > - 1).toBeTruthy();
+		expect(result && result.indexOf('width="2em"') > - 1).toBeTruthy();
+		expect(result && result.indexOf('height="2em"') > - 1).toBeTruthy();
+	});
+
+	test('loadIcon preserves customizations order', async () => {
+		const result = await loadIcon('flat-color-icons', 'up-right', {
+			scale: 1,
+			defaultStyle: 'color: red;',
+			defaultClass: 'clazz1',
+			customizations: {
+				additionalProps: {
+					'width': '2em',
+					'height': '2em',
+					'style': 'color: blue;',
+					'class': 'clazz2',
+				},
+				// it will never be called, it is not a custom icon
+				transform(icon) {
+					return icon.replace('<svg ', '<svg width="4em" height="4em" ');
+				},
+			}
+		});
+		expect(result).toBeTruthy();
+		expect(result && result.includes('style="color: blue;"')).toBeTruthy();
+		expect(result && result.includes('class="clazz2"')).toBeTruthy();
+		expect(result && result.includes('width="2em"')).toBeTruthy();
+		expect(result && result.includes('height="2em"')).toBeTruthy();
+	});
+});
diff --git a/packages/utils/tests/load-icon-test.ts b/packages/utils/tests/load-icon-test.ts
new file mode 100644
index 0000000..514208d
--- /dev/null
+++ b/packages/utils/tests/load-icon-test.ts
@@ -0,0 +1,69 @@
+import { promises as fs } from 'fs';
+import { CustomIconLoader, loadIcon } from '../lib';
+
+const fixturesDir = __dirname + '/fixtures';
+
+const loader: CustomIconLoader = async(name) => {
+	return await fs.readFile(`${fixturesDir}/${name}.svg`, 'utf8');
+}
+
+describe('Testing loadIcon', () => {
+	test('CustomCollection', async () => {
+		const svg = await loader('circle');
+		expect(svg).toBeTruthy();
+		const result = await loadIcon('a', 'circle', {
+			customCollections: {
+				'a': {
+					'circle': svg as string,
+				},
+			},
+		});
+		expect(result).toBeTruthy();
+		expect(svg).toEqual(result);
+	});
+
+	test('CustomCollection with transform', async () => {
+		const svg = await loader('circle');
+		expect(svg).toBeTruthy();
+		const result = await loadIcon('a', 'circle', {
+			customCollections: {
+				'a': {
+					'circle': svg as string,
+				},
+			},
+			customizations: {
+				transform(icon) {
+					return icon.replace('<svg ', '<svg width="1em" height="1em" ');
+				},
+			},
+		});
+		expect(result).toBeTruthy();
+		expect(result && result.indexOf('width="1em"') > -1).toBeTruthy();
+		expect(result && result.indexOf('height="1em"') > -1).toBeTruthy();
+	});
+
+	test('CustomCollection Icon with XML heading', async () => {
+		const svg = await loader('1f3eb');
+		expect(svg).toBeTruthy();
+		// Intercept console.warn
+		let warned = false;
+		const warn = console.warn;
+		console.warn = (/*...args*/) => {
+			// warn.apply(this, args);
+			warned = true;
+		};
+
+		const result = await loadIcon('a', '1f3eb', {
+			customCollections: {
+				'a': {
+					'1f3eb': svg as string,
+				},
+			},
+		});
+		// Restore console.warn
+		console.warn = warn;
+
+		expect(svg).toEqual(result);
+		expect(warned).toEqual(true);
+	});
+});