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chromium/third_party/blink/web_tests/external/wpt/html/browsers/browsing-the-web/navigating-across-documents/replace-before-load/resources/slow-code-injector.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>Subframe</title>

<body>
<script>
"use strict";
{{GET[code]}}
</script>

<!--
  This is necessary in cases involving user interaction because those happen async through the
  webdriver infrastructure. Without this, the load event might happen before the click ever goes
  through.
-->
<img src="/common/slow.py">