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chromium/third_party/blink/web_tests/external/wpt/acid/acid2/reftest.html 

<!doctype html>
<html class=reftest-wait>
<title>Acid2 reftest</title>
<link rel="match" href="px-reference.html">
<script src="/common/reftest-wait.js"></script>
<style>
* {
  margin: 0;
  padding: 0;
  border: 0;
}
iframe {
  width: 400px;
  height: 300px;
}
</style>
<script>
function frameLoaded(frame) {
  let fwin = frame.contentWindow;
  let fdoc = frame.contentDocument;
  fdoc.querySelector("#top").scrollIntoView();
  takeScreenshot();
}
</script>
<iframe src="test.html" onload="frameLoaded(this)"></iframe>