CSS @viewport, need more test in lower versions of Opera Mobile, and other mobile browsers.
Update xhr timeout support bug.

Chrome supports it since M29:
  https://code.google.com/p/chromium/issues/detail?id=231959
Firefox supports it since M12:
  https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest#Browser_Compatibility
WebKitMutationObserver iOS 6 implementation bug
Merge pull request #237 from MayhemYDG/patch-1

Update xhr timeout support bug.
Merge pull request #238 from kozlice/patch-2

WebKitMutationObserver iOS 6 implementation bug
data update
data update
data update
data update
IE8 has partial support for CSS3 selectors

When running the [test suite](http://tools.css3.info/selectors-test/test.html) on MSIE 8.0.7601.17514:
```
From the 41 selectors 20 have passed, 1 are buggy and 20 are unsupported (Passed 345 out of 574 tests)
```
Flexbox is unprefixed in Chrome 29.

https://code.google.com/p/chromium/issues/detail?id=249111
Update sandbox attribute for iframes with Firefox
data update
Merge pull request #243 from MayhemYDG/patch-1

Flexbox is unprefixed in Chrome 29.
Merge pull request #242 from ianjmacintosh/master

IE8 has partial support for CSS3 selectors
Merge pull request #244 from Cyril-sf/allow-popups

Update sandbox attribute for iframes with Firefox
data update
data update
+ 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.