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chromium/chrome/test/data/safe_browsing/download_protection/navigation_observer/iframe.html 

<html>
  <head>
    <script>
      function clickLink(linkId) {
        var node = document.getElementById(linkId);
        if (node != null)
          node.click();
      }
    </script>
  </head>
  <body>
    <a id="iframe_direct_download" href="../signed.exe">
      Direct download from an iframe
    </a><br>
  </body>
</html>