Use correct box-sizing when calculating block size.
Created attachment 461303 [details] Patch
This patch modifies the imported WPT tests. Please ensure that any changes on the tests (not coming from a WPT import) are exported to WPT. Please see https://trac.webkit.org/wiki/WPTExportProcess
Created attachment 461304 [details] Patch
Submitted web-platform-tests pull request: https://github.com/web-platform-tests/wpt/pull/35281
Pull request: https://github.com/WebKit/WebKit/pull/2947
Committed 253064@main (871d8bc405ad): <https://commits.webkit.org/253064@main> Reviewed commits have been landed. Closing PR #2947 and removing active labels.
<rdar://problem/98033954>