diff --git a/src/vs/base/browser/ui/sash/sash.ts b/src/vs/base/browser/ui/sash/sash.ts
index 3e0efee82c9f7711580a172f217431017d16f100..70ddb0453016a3583363479cf28f5e5d7a66859a 100644
--- a/src/vs/base/browser/ui/sash/sash.ts
+++ b/src/vs/base/browser/ui/sash/sash.ts
@@ -212,7 +212,13 @@ export class Sash extends Disposable {
 			return;
 		}
 
-		const iframes = getElementsByTagName('iframe');
+		// Select both iframes and webviews; internally Electron nests an iframe
+		// in its <webview> component, but this isn't queryable.
+		const iframes = [
+			...getElementsByTagName('iframe'),
+			...getElementsByTagName('webview'),
+		];
+
 		for (const iframe of iframes) {
 			iframe.style.pointerEvents = 'none'; // disable mouse events on iframes as long as we drag the sash
 		}
@@ -280,7 +286,6 @@ export class Sash extends Disposable {
 
 			dispose(disposables);
 
-			const iframes = getElementsByTagName('iframe');
 			for (const iframe of iframes) {
 				iframe.style.pointerEvents = 'auto';
 			}