<i>Highest z-index was an astonishing 999999999999999999999999999 or 9.99e26. With a default key repeat on OS X, this would take 3 seconds of holding down 9 to type. If you took that many pieces of paper at .05mm thick, the stack would reach from Earth to the Sun 10 trillion times. The worst part about this large of a z-index is that a number that high will overflow and not work in the expected manner anyhow. The lowest was a more reasonable -999999.</i><p>FWIW, max z-index that is cross-browser safe is: 16777271
imo, flex-box and evangelism of box-sizing border-box have been the best things since CSS3 selectors and transforms/transitions.<p>i only wish that <col> elements could propagate style rules as if they were parents of all the related td/th cells. there's still no way to specify text-align and font-* on entire columns easily, which is just silly.
Also see Chrome's statistics on CSS (and other web tech) usage: <a href="https://www.chromestatus.com/metrics/css/popularity" rel="nofollow">https://www.chromestatus.com/metrics/css/popularity</a>
I wish Apple would add a SASS/CSS compiler into XCode for native UI. I know there are a couple side projects for this but if it were baked in it could really take off.<p>Besides the potential of sharing across platforms, it would be one less system for layout and styles that had to be learned.
A few things that stuck out:<p>* `content` is in the top 5 properties?<p>* Glad to see nobody else uses two colons on pseudo selectors.<p>* I can't believe how rare rgb color usage is! 0.4%? hsl I can believe.<p>* I'd be interested to see how many sites use `!important` (the correct number in a style sheet is zero).