Align list of supported tags in rendered markdown (#161544)

This expands the list of html tags we allow in markdown. To get this list, I've copied the list of tags from `markdownDocumentRenderer` into `dom` after  reviewing them

For #134514, I've also added `video` to the list of allowed tags

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

@@ -8,21 +8,27 @@ 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',
+const allowedHtmlTags = Object.freeze(['a',
+	'abbr',
 	'b',
+	'bdo',
 	'blockquote',
 	'br',
-	'button',
 	'caption',
-	'center',
+	'cite',
 	'code',
 	'col',
 	'colgroup',
+	'dd',
+	'del',
 	'details',
+	'dfn',
 	'div',
+	'dl',
+	'dt',
 	'em',
-	'font',
+	'figcaption',
+	'figure',
 	'h1',
 	'h2',
 	'h3',
@@ -32,16 +38,23 @@ const allowedHtmlTags = Object.freeze([
 	'hr',
 	'i',
 	'img',
-	'input',
+	'ins',
 	'kbd',
 	'label',
 	'li',
+	'mark',
 	'ol',
 	'p',
 	'pre',
-	'select',
+	'q',
+	'rp',
+	'rt',
+	'ruby',
+	'samp',
+	'small',
 	'small',
 	'span',
+	'strike',
 	'strong',
 	'sub',
 	'summary',
@@ -49,15 +62,17 @@ const allowedHtmlTags = Object.freeze([
 	'table',
 	'tbody',
 	'td',
-	'textarea',
 	'tfoot',
 	'th',
 	'thead',
+	'time',
 	'tr',
 	'tt',
 	'u',
 	'ul',
+	'var',
 	'video',
+	'wbr',
 ]);
 
 const allowedSvgTags = Object.freeze([