Look at https://drafts.csswg.org/css-fonts-3/#font-family-casing in High Sierra on a 1x screen. Screenshot attached.
Created attachment 316655 [details] Screenshot
<rdar://problem/33594542>
Created attachment 324775 [details] Patch
Need to skip the test on iOS.
Comment on attachment 324775 [details] Patch Attachment 324775 [details] did not pass ios-sim-ews (ios-simulator-wk2): Output: http://webkit-queues.webkit.org/results/4978965 New failing tests: compositing/contents-format/subpixel-antialiased-nested-layer.html
Created attachment 324786 [details] Archive of layout-test-results from ews123 for ios-simulator-wk2 The attached test failures were seen while running run-webkit-tests on the ios-sim-ews. Bot: ews123 Port: ios-simulator-wk2 Platform: Mac OS X 10.12.6
https://trac.webkit.org/r223992