chromium/chrome/test/data/page_load_metrics/javascript_window_open.html

<html>
  <head>
    <style>
      body {
        margin: 0px;
      }
      a {
        font-size: 1000px;
      }
    </style>
  </head>
  <body>
    <a onclick="window.open('/title1.html');">CLICK ME</a>
  </body>
</html>