diff --git a/src/vs/base/browser/dom.ts b/src/vs/base/browser/dom.ts
index d7d5621eec4..ce34cfd69de 100644
--- a/src/vs/base/browser/dom.ts
+++ b/src/vs/base/browser/dom.ts
@@ -34,7 +34,7 @@ export function isInDOM(node: Node | null): boolean {
 		if (node === document.body) {
 			return true;
 		}
-		node = node.parentNode;
+		node = node.parentNode || (node as ShadowRoot).host;
 	}
 	return false;
 }