"Rem units and Mobile Safari" should mention affected iOS version

[cvrebert]

Apple might fix the bug eventually. Stating the most-recently-checked-affected-version will aid in keeping the section accurate & up-to-date.

[kkirsche]

I wasn't able to get the flickering effect on iOS 8.1.3 on my iPhone 5S or iPad 3

http://jsbin.com/mofuninafe/1/edit?html,css,output