Enable safe inline svg tags in trusted html (microsoft#156216)

Enable safe svg tags in trusted html

From https://github.com/cure53/DOMPurify/blob/cce00ac40d33c2aae6422eaa59e6a8aad5c73901/src/tags.js#L124

Author: mjbvz

extensions/markdown-language-features/notebook/index.ts

@@ -8,57 +8,108 @@ import MarkdownIt from 'markdown-it';
 import type * as MarkdownItToken from 'markdown-it/lib/token';
 import type { ActivationFunction } from 'vscode-notebook-renderer';
 
+const allowedHtmlTags = Object.freeze([
+	'a',
+	'b',
+	'blockquote',
+	'br',
+	'button',
+	'caption',
+	'center',
+	'code',
+	'col',
+	'colgroup',
+	'details',
+	'div',
+	'em',
+	'font',
+	'h1',
+	'h2',
+	'h3',
+	'h4',
+	'h5',
+	'h6',
+	'hr',
+	'i',
+	'img',
+	'input',
+	'kbd',
+	'label',
+	'li',
+	'ol',
+	'p',
+	'pre',
+	'select',
+	'small',
+	'span',
+	'strong',
+	'sub',
+	'summary',
+	'sup',
+	'table',
+	'tbody',
+	'td',
+	'textarea',
+	'tfoot',
+	'th',
+	'thead',
+	'tr',
+	'tt',
+	'u',
+	'ul',
+	'video',
+]);
+
+const allowedSvgTags = Object.freeze([
+	'svg',
+	'a',
+	'altglyph',
+	'altglyphdef',
+	'altglyphitem',
+	'animatecolor',
+	'animatemotion',
+	'animatetransform',
+	'circle',
+	'clippath',
+	'defs',
+	'desc',
+	'ellipse',
+	'filter',
+	'font',
+	'g',
+	'glyph',
+	'glyphref',
+	'hkern',
+	'image',
+	'line',
+	'lineargradient',
+	'marker',
+	'mask',
+	'metadata',
+	'mpath',
+	'path',
+	'pattern',
+	'polygon',
+	'polyline',
+	'radialgradient',
+	'rect',
+	'stop',
+	'style',
+	'switch',
+	'symbol',
+	'text',
+	'textpath',
+	'title',
+	'tref',
+	'tspan',
+	'view',
+	'vkern',
+]);
+
 const sanitizerOptions: DOMPurify.Config = {
 	ALLOWED_TAGS: [
-		'a',
-		'b',
-		'blockquote',
-		'br',
-		'button',
-		'caption',
-		'center',
-		'code',
-		'col',
-		'colgroup',
-		'details',
-		'div',
-		'em',
-		'font',
-		'h1',
-		'h2',
-		'h3',
-		'h4',
-		'h5',
-		'h6',
-		'hr',
-		'i',
-		'img',
-		'input',
-		'kbd',
-		'label',
-		'li',
-		'ol',
-		'p',
-		'pre',
-		'select',
-		'small',
-		'span',
-		'strong',
-		'sub',
-		'summary',
-		'sup',
-		'table',
-		'tbody',
-		'td',
-		'textarea',
-		'tfoot',
-		'th',
-		'thead',
-		'tr',
-		'tt',
-		'u',
-		'ul',
-		'video',
+		...allowedHtmlTags,
+		...allowedSvgTags,
 	],
 };