chromium/third_party/blink/web_tests/fast/plugins/empty-url-object.html

<!DOCTYPE html>
<html>
<body>
<script>
if (window.testRunner) {
    testRunner.dumpAsText();
    testRunner.dumpChildFrames();
}
</script>
This text should only appear once.
<object data="" type="text/plain"></object>
</body>
</html>