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chromium/third_party/blink/web_tests/external/wpt/html/semantics/document-metadata/the-link-element/stylesheet-change-href.html 

<!doctype html>
<meta charset="utf-8">
<title>Obtaining a new stylesheet removes styles from the previous stylesheet.</title>
<link rel=match href=stylesheet-change-href-ref.html>
<script>
  function changeHref() {
    var elem = document.getElementById('stylesheet');
    elem.href = 'resources/good.css';
    elem.onload = null;
  }
</script>
<link id=stylesheet rel=stylesheet href="resources/bad.css" onload="changeHref()">
<p>This text should be green on a white background