Codebase Browser
chromium
Go to App

chromium/third_party/blink/web_tests/external/wpt/html/browsers/browsing-the-web/navigating-across-documents/source/support/set-parent-src.html 

<!doctype html>
<meta charset=utf-8>
<script>
  function go() {
  	frameElement.src = "support/dummy.html"
  }
</script>
<p>Hello. Go.