Looks like this is a web-compatible issue now, and I guess what we need is update the types of `grid-auto-columns` & `grid-auto-rows`, and update `nsGridContainerFrame::TrackSizingFunctions` to accept an array of track-size.
Bug 1339672 Comment 6 Edit History
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Looks like this is a web-compatible issue now, and I guess what we need is update the types of `grid-auto-columns` & `grid-auto-rows`, and update `nsGridContainerFrame::TrackSizingFunctions` to accept an array of auto size.