CSS @viewport, need more test in lower versions of Opera Mobile, and other mobile browsers.
+ http://demo.agektmr.com/datalist/
IE8 apparently does NOT support :nth-child, :nth-of-type, :last-child

According to http://quirksmode.org/css/selectors/#t53 these selectors do NOT work on IE8, contrary to what is reported here.
DeviceOrientation in IE11

IE11 supports deviceorientation and devicemotion, but not compassneedscalibration.
CSS `@supports` bug on Chrome and Opera.
Safari 7 does not support templates
Safari 7 does not support Navigation Timing API
Safari 7 supports MutationObserver without prefix
Safari 7 does not support Datalist element
Safari 7 does not support Download attribute
Safari 7 does not support Color input type
Update text-overflow.json

revised Opera note
Update intrinsic-width.json

Added Prefix support for iOS 7 and Mac OS X Safari 7.
Merge pull request #246 from tomByrer/patch-1

+ http://demo.agektmr.com/datalist/
Merge pull request #249 from SaschaNaz/patch-6

DeviceOrientation in IE11
Merge pull request #251 from MayhemYDG/patch-2

CSS `@supports` bug on Chrome and Opera.
Merge pull request #252 from tsapeta/master

Update info about support in Safari 7.0
Merge pull request #255 from mattbrundage/patch-2

Update text-overflow.json
Merge pull request #256 from stopsatgreen/master

Updated implementation for Safari 6.1 and 7
Merge pull request #258 from tomoakley/patch-1

Update intrinsic-width.json