use textcontent in menu css

refs #106395

Author: sbatten

src/vs/base/browser/ui/menu/menu.ts

@@ -229,11 +229,11 @@ export class Menu extends ActionBar {
 	private initializeStyleSheet(container: HTMLElement): void {
 		if (isInShadowDOM(container)) {
 			this.styleSheet = createStyleSheet(container);
-			this.styleSheet.innerHTML = MENU_WIDGET_CSS;
+			this.styleSheet.textContent = MENU_WIDGET_CSS;
 		} else {
 			if (!Menu.globalStyleSheet) {
 				Menu.globalStyleSheet = createStyleSheet();
-				Menu.globalStyleSheet.innerHTML = MENU_WIDGET_CSS;
+				Menu.globalStyleSheet.textContent = MENU_WIDGET_CSS;
 			}
 
 			this.styleSheet = Menu.globalStyleSheet;