This test uses "transform: rotateY(180deg); backface-visibility: hidden" together with a child element with "will-change: transform" to hide said child element, but the element appears unhidden on WPE and GTK.
Test gardening commit 269120@main (926f510b962d): <https://commits.webkit.org/269120@main> Reviewed commits have been landed. Closing PR #18844 and removing active labels.