We have Modernizr to handle the HTML5 and CSS3 problem in old browsers.
Modernizr – Tackle the HTML5 and CSS3 problems in old browsers for frontend programming
Today, i would like to introduce another tool which could help you aligning the CSS styles for different browsers as well as OS. This tool is called CSS Browser Selector. Although it is not updated for more than a year, it is still very useful if you need to deal with Internet Explorer 7 & 8.
Similar to Modernizr, what u need to do is just included the library in the <head> tag.
Continue reading CSS Browser Selector – Align the CSS styles for different browsers and OS