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The test assumed that block fragmentation takes place after relative
positioning, but it's the other way around:
https://www.w3.org/TR/css-break-3/#transforms

Bug: 829028
Change-Id: I297bf572354216188b5a8c8d007f7a137c36e773
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2554543Reviewed-by: Ian Kilpatrick <ikilpatrick@chromium.org>
Commit-Queue: Morten Stenshorne <mstensho@chromium.org>
Cr-Commit-Position: refs/heads/master@{#830212}