chromium/third_party/blink/web_tests/http/tests/security/mixedContent/resources/frame-with-insecure-plugin.html

<!DOCTYPE html>
<script>
window.onload = function() {
  setTimeout(function() {
    if (window.internals)
      internals.updateLayoutAndRunPostLayoutTasks(document);
    if (window.testRunner)
      testRunner.notifyDone();
  }, 1);
}
</script>
<object name='plugin' type='application/x-blink-test-plugin'>
  <param name='movie' value='http://example.test:8000/security/mixedContent/resources/dummy.swf' />
</object>