[Gecko Bug 1994083] Add WPTs for abspos fragmentation in vertical-rl writing-mode. #56207
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These tests verify that
.container's border-start is subtracted correctly whencomputing the abspos containing block size, which is critical to position abspos
element in vertical-rl writing-mode.
Differential Revision: https://phabricator.services.mozilla.com/D272403
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1994083
gecko-commit: 16bc9d85034fc46bbb6cd5aa97b4fc9a6b3440d7
gecko-reviewers: dholbert