chromium/third_party/blink/web_tests/http/tests/devtools/extensions/resources/extensions-network.html

<style>
@font-face {
    font-family: 'test';
    src: url('../../../resources/Ahem.ttf');
}

p { font-family: 'test'; }
</style>
<img src="abe.png">
<img src="missing-image.png">
<script>
function doXHR() {
  return fetch('extensions-network.html');
}
</script>
<p>some text.</p>
<link rel="stylesheet" href="audits-style1.css">