This affects @font-face format() parsing and @supports font-format() evaluation.
<rdar://problem/108897052>
We should ideally match `FontCustomPlatformData::supportsFormat`
Pull request: https://github.com/WebKit/WebKit/pull/13513
Committed 263914@main (0a0261e666d9): <https://commits.webkit.org/263914@main> Reviewed commits have been landed. Closing PR #13513 and removing active labels.