Merge pull request #686 from yisibl/master

data update(IE 10)
data update
data update
Fixed a minor typo

Fixed a very small typo.
Merge pull request #688 from weareknights/patch-1

Fixed a minor typo
data update
Update validator
data update
Update info with IE ID and Chrome ID
flexbox - superfluous </a>
Merge pull request #691 from paulirish/patch-4

flexbox - fixing superfluous </a>
Use double-colon syntax for pseudo-elements

The fact that IE8 only recognizes :before and :after with a single colon is mentioned in the notes already.

http://www.w3.org/TR/css3-content/#pseudo-elements: “Authors are encouraged to use the new two-colon forms.”
data update
data update
tiny typo fix
various minor typo and broken links fixes
data update
Correct input-placeholder stats for Opera 11.50

Opera 11.50 also supports the placeholder attribute on <textarea>. This
was determined using Opera 11.50 on Windows 7 installed with the archived
installer: http://arc.opera.com/pub/opera/win/1150/en/Opera_1150_en_Setup.exe
and a jsFiddle: http://jsfiddle.net/qmdxjro0/
Screenshot: http://i.imgur.com/bfsxm80.png
Safari 8 has high resolution timers

Both Safari 8 and iOS Safari 8 have high resolution timers. There exists window.performance instance and you can do 'window.performance.now()' to get the floating point millisecond elapsed time.
Merge pull request #696 from andreasbovens/master

small fixes to article URLs and some typos