Yes, it looks like those subproperties were all added as part of the same commit, in https://hg.mozilla.org/mozilla-central/rev/a5256a2aded7 See e.g. this chunk which added testing for all 4 of those plus the `contain-intrinsic-size` shorthand: https://hg.mozilla.org/mozilla-central/rev/a5256a2aded7#l5.12
Bug 1597529 Comment 10 Edit History
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Yes, it looks like those per-axis properties were all added as part of the same commit, in https://hg.mozilla.org/mozilla-central/rev/a5256a2aded7 See e.g. this chunk which added testing for all 4 of those plus the `contain-intrinsic-size` shorthand: https://hg.mozilla.org/mozilla-central/rev/a5256a2aded7#l5.12