Currently ::backdrop is visible for any elements in the Web Inspector. (reported by Simon Fraser) a special case could be added to hide it in most cases, as it is already done for ::marker. `if (pseudoId == PseudoId::Backdrop && !element->isInTopLayer())` (suggestion from Antti Koivisto)
<rdar://problem/104889944>
Pull request: https://github.com/WebKit/WebKit/pull/9638
Committed 259894@main (c5064e5e284d): <https://commits.webkit.org/259894@main> Reviewed commits have been landed. Closing PR #9638 and removing active labels.