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Since the release of CSS Level 2 Recommendation ten years ago in may 1998, the Web authors' community has been requesting a way of defining variables in CSS. Variables allow to define stylesheet-wide values identified by a token and usable in all CSS declarations. If a value is often used in a stylesheet - a common example is the value of the color or background-color properties - it's then easy to update the whole stylesheet statically or dynamically modifying just one variable instead of modifying all style rules applying the property/value pair.

w00t!