Getting Started With CSS calc()
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I first discovered the calc() function more than four years ago, thanks to CSS3 Click Chart, and I was absolutely delighted to see that basic mathematical computations — addition, subtraction, multiplication and division — had found their way into CSS.
A lot of people think preprocessors fully cover the realm of logic and computation, but the calc() function can do something that no preprocessor can: mix any kind of units. Preprocessors can only mix units with a fixed relation between them, like angular units, time units, frequency units, resolution units and certain length units.
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