IssueTracker

Currently third_party/blink/renderer/core/html/resources/html.css has the following code:
  :focus {
    outline: auto 1px -webkit-focus-ring-color
  }

This causes that when you click an element like:
  <div tabindex="0">foo</div>
The element gets a focus ring (an outline).

That's precisely what :focus-visible is trying to avoid, so now that it has shipped we should change the UA stylesheet to use :focus-visible directly.

Also this will align Chromium with the spec text (https://drafts.csswg.org/selectors-4/#the-focus-visible-pseudo):
"User agents should also use :focus-visible to specify the default focus style, so that authors using :focus-visible will not also need to disable the default :focus style."

See https://github.com/w3c/csswg-drafts/issues/4278 for more info.

BTW, in Firefox you don't get a focus ring when you click an element like that.