src/vs/workbench/contrib/notebook/browser/view/renderers/webviewPreloads.ts/MarkdownCodeBlock/requestHighlightCodeBlock
class MarkdownCodeBlock:		public static requestHighlightCodeBlock(root: HTMLElement | ShadowRoot) {
			const codeBlocks: Array<{ value: string; lang: string; id: string }> = [];
			let i = 0;
			for (const el of root.querySelectorAll('.vscode-code-block')) {
				const lang = el.getAttribute('data-vscode-code-block-lang');
				if (el.textContent && lang) {
					const id = `${Date.now()}-${i++}`;
					codeBlocks.push({ value: el.textContent, lang: lang, id });
					MarkdownCodeBlock.pendingCodeBlocksToHighlight.set(id, el as HTMLElement);
				}
			}

			return codeBlocks;
		}