chromium/third_party/blink/web_tests/fast/replaced/no-focus-ring-object.html

<!DOCTYPE html>
<style>
  #test { border: 20px solid orange; background-color: blue }
</style>

<object id="test" tabIndex="1" type="application/x-webkit-test-webplugin">
</object><br>
This test requires DumpRenderTree. Click the orange border, a focus ring should not appear.

<script src="resources/focus-test.js"></script>