[Buttons] Address various browser compatibility issues #4108
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This PR addresses various browser compatibility issues present in some recent chrome releases (dating back to dec 2015). See #4093 for more details.
I added a test for this particular issue: #4093 (comment)
Some of the CSS may look unnecessary at first glance (or even first test) -- but it took me a fair bit of tinkering to get this working across the different Chrome versions (I checked IE, FF, Safari too).
Here's some screenshots of problems it fixes: