See testcase. The red <div> should be exactly as tall as its green (orthogonal) child, but is incorrectly extended by the height of the child's top/bottom borders.
Bug 1949151 Comment 0 Edit History
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See testcase. The red <div> should be exactly as tall as its green (orthogonal) child, but is incorrectly extended by the height of the child's top/bottom borders. Note that in contrast to bug 1949148 and bug 1949149, zooming does NOT "fix" the rendering here; the layout is stable (but wrong).