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Interesting, this killer feature is prefixed in a dev build of Chrome, stable Firefox... but unprefixed in IE9.
CSS layout gets smarter with calc(): Didn’t even know about this feature, but it’s brilliant. A quick idea of what you can do: #bar { height: calc(10em + 3px); } And regarding current support: The calc() property for lengths is available now in Chrome 19 (Dev channel build) by use of the ‘-webkit-calc’ property, in Firefox since version 8 using the ‘-moz-calc’ property and in Internet Explorer since version 9 unprefixed.
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