It seems we're simply not propagating the `flex-shrink` style to the table wrapper. If I add these then we render the testcase the same as Chrome. Adding `flex-basis` also fixes bug 1454330 for the most part - we now render it the same if the window is narrow, but the items doesn't stretch the same when the window is very wide, so it seems there is some additional issue there (assuming the Chrome is correct that is).
Bug 1673006 Comment 4 Edit History
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It seems we're simply not propagating the `flex-shrink` style to the table wrapper. If I add these then we render the testcase the same as Chrome. Adding `flex-basis` also fixes bug 1454330 for the most part - we now render it the same if the window is narrow, but the items doesn't stretch the same when the window is very wide, so it seems there is some additional issue there (assuming Chrome is correct that is).