Box does not fill expected space.
<rdar://problem/89196582>
imported/w3c/web-platform-tests/css/css-contain/contain-size-breaks-001.html [ ImageOnlyFailure ] imported/w3c/web-platform-tests/css/css-text/line-break/line-break-anywhere-and-white-space-003.html [ ImageOnlyFailure Pass ] imported/w3c/web-platform-tests/css/css-text/white-space/break-spaces-006.html [ ImageOnlyFailure Pass ] imported/w3c/web-platform-tests/css/css-text/white-space/break-spaces-with-overflow-wrap-004.html [ ImageOnlyFailure Pass ]
The non-flaky test failure is fixed by the patch in bug 237728. I suspect the flaky failures will also be fixed, but leaving open for the now.
All are fixed. *** This bug has been marked as a duplicate of bug 237728 ***