CSS Grid is now in Firefox (52) Beta. For bugs we need to hear about before shipping, tell us in next 2-3 weeks at bugzilla.mozilla.org/enter_b…

Jan 26, 2017 · 3:05 AM UTC

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Spec: drafts.csswg.org/css-grid/ MDN docs: developer.mozilla.org/en-US/… Demos by @jensimmons: labs.jensimmons.com/
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No, subgrid is not included. (But we already implement display:contents, which can do some of the things subgrid can do.)
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