Add additional tests related to styling of details element.
Change-Id: I84f532acfce9e39a324587ae4abc977eaa39d5a6
Bug: 1469418
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5631738
Auto-Submit: David Baron dbaron@chromium.org
Commit-Queue: Joey Arhar jarhar@chromium.org
Reviewed-by: Joey Arhar jarhar@chromium.org
Cr-Commit-Position: refs/heads/main@{#1317398}