As you may have noticed if you are a regular here, I just refreshed the theme on this site to a custom theme built on Bartik. And since Chrome had just been updated, I took the newly updated performance audit.
What more to say ?
If all of a sudden you notice that the SELECT elements in your Drupal forms increases to 4 and any smaller size is ignored...
... maybe you've already forgotten you were using Chrome, and it is not a Drupal bug : this is a "usability" feature of WebKit. See http://trac.webkit.org/browser/trunk/WebCore/rendering/RenderListBox.cpp#L67.
Safari users are probably used to it, but for users of other browsers, this is a bit disconcerting.