I intend to enable CSS subgrid by default for v71.
*Summary: *
The CSS Grid 2 subgrid feature allows nested grids to participate in the
sizing of their parent's tracks, on a per-axis basis.
*Bug to turn on by default: *
https://bugzilla.mozilla.org/show_bug.cgi?id=1580894
*Meta bug where this feature is developed:*
https://bugzilla.mozilla.org/show_bug.cgi?id=1240834
*Standard:*
https://drafts.csswg.org/css-grid-2/#subgrids
*Platform coverage:*
All platforms.
*DevTools bug:*
Subgrid is supported in devtools. Metabug:
https://bugzilla.mozilla.org/show_bug.cgi?id=1464440
*Other browsers: *
Blink/WebKit doesn't support subgrid so far, but it is expected that they
eventually will. Folks from Igalia and others have been participating in
the spec discussions.
*web-platform-tests: *
https://github.com/web-platform-tests/wpt/tree/master/css/css-grid/subgrid
*Secure contexts:* N/A
*Note:*
There is one unresolved spec issue under discussion:
https://github.com/w3c/csswg-drafts/issues/4411 which might require
updating our implementation. I don't feel like it's a major issue that
needs to block us from shipping. There should be a resolution soon and
hopefully we can uplift any potential changes as a bug fix before it's
released.
/Mats
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