diff --git a/adev/src/app/app.component.ts b/adev/src/app/app.component.ts
index d1a5618d66e..37dd27d79c4 100644
--- a/adev/src/app/app.component.ts
+++ b/adev/src/app/app.component.ts
@@ -82,6 +82,14 @@ export class AppComponent {
   }
 
   protected focusFirstHeading(): void {
+    const main = this.document.querySelector<HTMLElement>('main');
+    if (main) {
+      main.setAttribute('tabindex', '-1');
+      main.focus();
+      return;
+    }
+
+    // Fallback: focus the first h1 (legacy support for pages without main)
     const h1 = this.document.querySelector<HTMLHeadingElement>('h1:not(docs-top-level-banner h1)');
     h1?.focus();
   }