closest-side is the default value.
<rdar://problem/110818689>
Actually, we also need to update parsing to make ray-size optional.
Pull request: https://github.com/WebKit/WebKit/pull/14995
Committed 265200@main (1a13191fa420): <https://commits.webkit.org/265200@main> Reviewed commits have been landed. Closing PR #14995 and removing active labels.