Add additional allowed tags in untrusted notebook markdown (#150228)

This adds some extra allowed tags when rendering markdown in notebooks. Additions are:

```
  "b",

    "br",

    "caption",

    "center",

    "col",

    "colgroup",

    "details",

    "em",

    "font",

    "i",

    "kbd",

    "sub",

    "summary",

    "sup",

    "table",

    "tbody",

    "tfoot",

    "thead",

    "td",

    "th",

    "tr",

    "tt",

    "u",

    "video"
```

1 files changed, 51 insertions, 1 deletions

diff --git a/extensions/markdown-language-features/notebook/index.ts b/extensions/markdown-language-features/notebook/index.ts
index 079ed928f3f..a036374fed1 100644
--- a/extensions/markdown-language-features/notebook/index.ts
+++ b/extensions/markdown-language-features/notebook/index.ts
@@ -9,7 +9,57 @@ import type * as MarkdownItToken from 'markdown-it/lib/token';
 import type { ActivationFunction } from 'vscode-notebook-renderer';
 
 const sanitizerOptions: DOMPurify.Config = {
-	ALLOWED_TAGS: ['a', 'button', 'blockquote', 'code', 'div', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'hr', 'img', 'input', 'label', 'li', 'p', 'pre', 'select', 'small', 'span', 'strong', 'textarea', 'ul', 'ol'],
+	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',
+	],
 };
 
 export const activate: ActivationFunction<void> = (ctx) => {