As noted in [phabricator](https://phabricator.services.mozilla.com/D35628#1060407), this needs a bit more work before it's ready... In particular, the patch as it stands would change **native-themed** default-sized `<select>` elements on Mac to end up 1px shorter than an equivalent `<button>`, which can make the descenders jut up against the widget border as shown at far right end of jfkthame's screenshot. This is because right now, native-themed `<select>` elements are **only 1px taller** than `<button>`, in Nightly on my mac mini -- e.g. in my attached testcase 3. For unthemed elements (in testcase 1 and 2), it's a 2px difference as described in comment 0. But for native-themed buttons it's only 1px for some reason (on mac).
Bug 1560824 Comment 10 Edit History
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As noted in [phabricator](https://phabricator.services.mozilla.com/D35628#1060407), this needs a bit more work before it's ready... In particular, the patch as it stands would change **native-themed** default-sized `<select>` elements on Mac for the worse -- they'd end up being 1px shorter than an equivalent `<button>`, which is inconsistent & can make glyphs with descenders jut up against the widget border as shown at far right end of jfkthame's screenshot. This is because right now, native-themed `<select>` elements are **only 1px taller** than `<button>`, in Nightly on my mac mini -- e.g. in my attached testcase 3. For unthemed elements (in testcase 1 and 2), it's a 2px difference as described in comment 0. But for native-themed buttons it's only 1px for some reason (on mac).