tiny typo fix
various minor typo and broken links fixes
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
Merge pull request #699 from dtrebbien/master

Correct input-placeholder stats for Opera 11.50
Merge pull request #700 from kicktheken/master

Safari 8 has high resolution timers