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CSS3 . Info - All you ever needed to know about CSS3
Another new property introduced by the CSS3 Backgrounds and Borders module is background-size . The property adds new functionality to CSS allowing designers to specify the size of background images using either lengths, percentages, or by using one of two keywords; contain or cover . Browser support has grown of late, with the current versions of most popular browsers now supporting background-size , including Firefox, Safari, Chrome, Internet Explorer and Opera, without the need for vendor prefixes.
Taking advantage of the new capabilities of HTML5 and CSS3 can mean sacrificing control over the experience in older browsers.