Support fr units for grids #228
Description
Please support 'fr' units, as listed on https://developer.mozilla.org/en-US/docs/Web/CSS/grid-template-columns .
Original request: CSSLint/csslint#691
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Please support 'fr' units, as listed on https://developer.mozilla.org/en-US/docs/Web/CSS/grid-template-columns .
Original request: CSSLint/csslint#691