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chromium/third_party/blink/web_tests/external/wpt/webdriver/tests/bidi/network/support/provide_response.html 

<!DOCTYPE html>
<html>
  <head>
    <meta charset=utf-8>
    <link rel="stylesheet" href="provide_response.css"/>
  </head>
  <body>
    <p>Provide response test page</p>
    <div>I am blue</div>
    <script type="text/javascript" src="provide_response.js"></script>
  </body>
</html>