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

<html>
  <head>
    <script>
      function clickLink(linkId) {
        var node = document.getElementById(linkId);
        if (node != null) {
          // Click and open link in the same tab.
          node.click();
        }
      }

      function runTest() {
        var download_url = "../signed.exe";
        var ifrm = document.createElement("iframe");
        ifrm.setAttribute("src", download_url);
        document.body.appendChild(ifrm);
      }
    </script>
  </head>
  <body>
    <a id="do_download" onclick="runTest()">Click for download</div>
  </body>
</html>