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feature: calc() status: use tags: fallback kind: css polyfillurls:

All browsers support calc() unprefixed, but do note that it can have a big impact on the layout and the consequent breaking of your design on unsupported browsers.

You should use it with a fallback declaration, so it doesn't break on browsers which don't support it.

width: 500px; /* older browsers */
width: calc(50% - 20px);