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;
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.
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background-size:cover; will be very useful for those websites with full background images that need to scale when the browser window is resized while still maintaining the aspect ratio. Great addition to the spec!
Background size would certainly be useful. I just created a artificial flower website at http://www.bloomin.ch where I need to adjust the size of the background on the fly so I will try it there first. Always found manipulating bg’s a hassle in CSS, lets hope this changes things