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chromium
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chromium/third_party/blink/web_tests/external/wpt/upgrade-insecure-requests/link-upgrade/resources/click-on-link.sub.html 

<body>
  coucou
  <a href="{{GET[url]}}">Click me</a>
</body>

<script>
  window.addEventListener("load", function() {
    document.getElementsByTagName("a")[0].click();
 })
</script>