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Fieldset elements require legacy layout, which also disables NG block
fragmentation. The test uses fieldset elements, while the ref doesn't.
There's a subtle rendering difference between the engines here. Not sure
if it's a bug or not, but we'll get to that once LayoutNGFieldset has
shipped.

TBR=futhark@chromium.org

Bug: 1028595
Change-Id: Ia63a2382719f02f8c24b485933a9fa1b56ee671e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1941310Reviewed-by: Morten Stenshorne <mstensho@chromium.org>
Commit-Queue: Morten Stenshorne <mstensho@chromium.org>
Cr-Commit-Position: refs/heads/master@{#719935}