<calc>
Allows you to perform calculations when specifying CSS property values. You can mix different units, like percentages and pixels, in the same expression.
Syntax
/* Usage Example */
.container {
width: calc(100% - 80px);
/* mixes percentage and pixels */
}<calc> Browser support
Widely available
Since
2015 96% global usage
This feature is well established and works across many devices and browser versions. It has been available across browsers since 2015.
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