Created attachment 226994 [details] test case When the font-size is defined on the html element and sizes are specified in rems, Safari 7 flickers the sizes back and forth when resizing around each responsive boundary. Video: http://youtu.be/_36K18JheP4 Steps to reproduce 1. Visit http://samhuri.net/f/grid-bug.html in Safari 7 on a Mac. 2. Resize your browser window enough to cross a responsive boundary, 40rem or 64rem in this case. 3. Observe the jank I fear I have not described the problem well, please see the attached test case. It should be clear. Let me know if I can help with anything! -s
I should note that when I define the font sizes on the body element instead of the html element, no such flicker occurs. You can see that in action at http://samhuri.net. Not sure if that's a useful tidbit or not.
Any update on this? This bug is still a problem on Safari 10.1.2. Combined with transitions and other things, it can destroy the usability of a website. (Fortunately, Sami's suggestion about moving the font sizes to `body` works. You're a lifesaver, Sami!)