diff --git a/extensions/markdown-language-features/preview-src/index.ts b/extensions/markdown-language-features/preview-src/index.ts
index 08c6759f05b..7e5aee5e277 100644
--- a/extensions/markdown-language-features/preview-src/index.ts
+++ b/extensions/markdown-language-features/preview-src/index.ts
@@ -68,7 +68,7 @@ onceDocumentLoaded(() => {
 		getRawData('data-initial-md-content'),
 		'text/html'
 	);
-	document.body.appendChild(markDownHtml.body);
+	document.body.append(...markDownHtml.body.children);
 
 	// Restore
 	const scrollProgress = state.scrollProgress;