Checking Browser supports in Frontend

http://caniuse.com/

http://www.quirksmode.org/compatibility.html

http://en.wikipedia.org/wiki/Comparison_of_layout_engines_(Cascading_Style_Sheets)

http://www.positioniseverything.net/

https://developer.mozilla.org/en/docs/Mozilla_CSS_support_chart

http://blog.chromium.org/