[text-box-trim] Change text-box-edge to require two values
This patch changes the text-box-edge property to require two
values if the over and the under are different, as per the
resolution at the CSS WG1:
Bug: 373867786, 40254880
Change-Id: I385bf5fa1fdb45cd6990f1a079878f5a683d8712
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6017004
Reviewed-by: Kent Tamura tkent@chromium.org
Auto-Submit: Koji Ishii kojii@chromium.org
Commit-Queue: Kent Tamura tkent@chromium.org
Cr-Commit-Position: refs/heads/main@{#1382625}