chromium/chrome/test/data/ssl/page_displays_insecure_iframe.html

<html>
<head><title>Page that displays insecure content</title>
<script>
  function IframeWidth() {
    return document.getElementById("bad_iframe").width;
  }
</script>
</head>
<body>
This page contains an iframe which is served over an http connection,
causing insecure content (when this page is loaded over https).<br>
<iframe id="bad_iframe" src="http://REPLACE_WITH_HOST_AND_PORT/ssl/bad_iframe.html"></iframe>

</body>
</html>