chromium/third_party/blink/manual_tests/focusringcolor-change-on-theme-change.html

<input value="Click on me!  Focus ring color around this input element should change." style="width:100%">
<ul>
<li>Select the input element above.</li>
<li>Change the system focus ring color.<br>On OS X you can do this by going to System Preferences-&gt;Appearance and selecting another value in the Appearance popup menu.</li>  
<li>Make Safari the active application again.</li>
</ul>

<p>The tests passes if the focus ring around the input element changes color.</p>