I've implemented the first alternative: https://treeherder.mozilla.org/#/jobs?repo=try&revision=d8eee8c41b3f9fc6e029298789220414301a7460 I don't think the second alternative makes much sense. I filed a [spec issue](https://github.com/w3c/csswg-drafts/issues/4931) to make CSS Grid explicitly point out that intrinsic track sizing is affected by `contain:size` too.
Bug 1488878 Comment 2 Edit History
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I've implemented the first alternative: https://treeherder.mozilla.org/#/jobs?repo=try&revision=d8eee8c41b3f9fc6e029298789220414301a7460 I don't think the second alternative (in comment 1) makes much sense. I filed a [spec issue](https://github.com/w3c/csswg-drafts/issues/4931) to make CSS Grid explicitly point out that intrinsic track sizing is affected by `contain:size` too.