When building without ENABLE(FILTERS_LEVEL_2), a use of cssUnprefixedBackdropFilterEnabled which is controlled by that flag fails because the use appears not to also be controlled by it.
Pull request: https://github.com/WebKit/WebKit/pull/18421
Committed 268665@main (c8ad412976d9): <https://commits.webkit.org/268665@main> Reviewed commits have been landed. Closing PR #18421 and removing active labels.
<rdar://problem/116251332>