chromium/chrome/test/data/extensions/api_test/content_scripts/prerendering/top_frame_only.js

// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

chrome.runtime.sendMessage('top_frame_only');

document.addEventListener('prerenderingchange', () => {
  chrome.runtime.sendMessage('activated');
});