While I was reviewing @bmansurov's change for T134894, I noticed that the "refreshed" search bar moved up 1px when I clicked it.
{F4188272}
Note well that:
* I don't see this behaviour in Chrome (51.0.2704.84); and
* I see this behaviour at all widths (mobile, tablet, and desktop)
* Happens in stable and beta.
**Example URL**: http://reading-web-staging.wmflabs.org/wiki/Main_Page?useformat=mobile
**Browser**: Firefox (47.0), Safari (9.1.1)
**OS**: OS X El Capitan 10.11.5
Suggested testbed, portrait and landscape:
[ ] Android 2.3 Browser phone form factor
[ ] Android 4.x/5.x/6.x Chrome phone form factor
[ ] Android 4.x/5.x/6.x Chrome tablet form factor
[ ] iOS 9.3 iPhone
[ ] iOS 9.3 iPad
[ ] Opera mobile (not mini) Android 4+ phone form factor
[ ] UC browser (not mini) Android 4+ phone form factor
[ ] Windows 7.5 Phone IE
[ ] Desktop Firefox
[ ] Desktop Chrome
[ ] Desktop Safari
[ ] Internet Explorer 11
Note that iOS 8.4 is out of scope while device / testing service available, but iOS 9.3 is pretty close to iOS 8.4 for layout.