Some of the tests imported in r282287 fail on GTK and WPE, in particular the following: imported/w3c/web-platform-tests/css/css-transforms/3dtransform-and-filter-no-perspective-001.html imported/w3c/web-platform-tests/css/css-transforms/backface-visibility-hidden-001.html imported/w3c/web-platform-tests/css/css-transforms/composited-under-rotateY-180deg-clip.html imported/w3c/web-platform-tests/css/css-transforms/composited-under-rotateY-180deg.html imported/w3c/web-platform-tests/css/css-transforms/dynamic-fixed-pos-cb-change.html imported/w3c/web-platform-tests/css/css-transforms/preserve3d-and-filter-with-perspective.html imported/w3c/web-platform-tests/css/css-transforms/transform-background-001.html imported/w3c/web-platform-tests/css/css-transforms/transform-background-002.html imported/w3c/web-platform-tests/css/css-transforms/transform-fixed-bg-007.html imported/w3c/web-platform-tests/css/css-transforms/transform-table-009.html imported/w3c/web-platform-tests/css/css-transforms/transform-table-010.html imported/w3c/web-platform-tests/css/css-transforms/transform-table-011.html imported/w3c/web-platform-tests/css/css-transforms/transform3d-rotatex-perspective-003.html imported/w3c/web-platform-tests/css/css-transforms/transforms-skewX.html
<rdar://problem/121074627>