purpose_prefetch_header.html | Explore in Territory

<!DOCTYPE html>
<body>
<script src="test_utils.js"></script>
<script>

async function run(tag) {
  // Fetch resources during prerendering.
  const iframe =
      await create_iframe(`purpose_prefetch_header_iframe.html?${tag}`);
  await create_img(`missing.jpg?${tag}`);
  await fetch(`missing.txt?${tag}`);

  // Fetch resources in the iframe during prerendering.
  await iframe.contentWindow.create_iframe(`../empty.html?${tag}`);
  await iframe.contentWindow.create_img(`iframe-missing.jpg?${tag}`);
  await iframe.contentWindow.fetch(`iframe-missing.txt?${tag}`);
}

async function request(url) {
  await fetch(url, { mode: 'cors' });
}

</script>
</body>

chromium/content/test/data/prerender/purpose_prefetch_header.html