264115 2023-11-02 15:08:11 -0700 An incorrect fallback font for Ahem returns where unicode-range is set. 2024-01-26 11:59:46 -0800 1 1 1 Unclassified WebKit Text WebKit Nightly Build Unspecified Unspecified NEW https://bugs.webkit.org/show_bug.cgi?id=264120 InRadar P2 Normal --- 1 changseok webkit-unassigned fantasai.bugs mmaxfield ntim vitor.roriz webkit-bug-importer oldest_to_newest 1989537 0 changseok 2023-11-02 15:08:11 -0700 While I was investigating the failure of size-adjust-unicode-range-system-fallback.html [1], I found Mac port behaved unexpectedly to unicode-range. Please try the following HTML snippet. ``` <style> @font-face { font-family: large-font; src: local(Ahem), url(/fonts/Ahem.ttf); size-adjust: 1000%; unicode-range: U+0020; } .test { font-family: large-font; } </style> <span class="test">X</span> ``` The expected result is a small `X`, but Mac port shows a large square from Ahem. Aside from the different sizes, unicode-range is set with U+0020 (i.e., space) so Ahem should be limited to only spaces. When I tracked down this issue, I encountered that CTFontCreateForCharactersWithLanguageAndOption returned Ahem as a fallback for Ahem in lookupFallbackFont() at FontCacheCoreText.cpp. However, further investigation was not possible since I could not see the definition of CTFontCreateForCharactersWithLanguageAndOption. Maybe, Apple folks want to look into this issue. FYI, GTK/WPE ports work fine. [1] https://wpt.fyi/results/css/css-fonts/size-adjust-unicode-range-system-fallback.html?label=experimental&label=master&aligned 1991290 1 webkit-bug-importer 2023-11-09 14:09:23 -0800 <rdar://problem/118199422> 2008002 2 469561 ap 2024-01-26 11:58:18 -0800 Created attachment 469561 test case 2008003 3 469562 ap 2024-01-26 11:59:00 -0800 Created attachment 469562 test case 2008004 4 ap 2024-01-26 11:59:46 -0800 The WPT link no longer shows the problem, as the test got changed to work around it. Attaching the original test. 469561 2024-01-26 11:58:18 -0800 2024-01-26 11:59:00 -0800 test case test.html text/html 229 ap PHN0eWxlPgpAZm9udC1mYWNlIHsKICBmb250LWZhbWlseTogbGFyZ2UtZm9udDsKICBzcmM6IGxv Y2FsKEFoZW0pLCB1cmwoaHR0cDovL3dwdC5saXZlL2ZvbnRzL0FoZW0udHRmKTsKICBzaXplLWFk anVzdDogMTAwMCU7CiAgdW5pY29kZS1yYW5nZTogVSswMDIwOwp9CgoudGVzdCB7CiAgZm9udC1m YW1pbHk6IGxhcmdlLWZvbnQ7Cn0KPC9zdHlsZT4KPHNwYW4gY2xhc3M9InRlc3QiPlg8L3NwYW4+ Cg== 469562 2024-01-26 11:59:00 -0800 2024-01-26 11:59:00 -0800 test case test.html text/html 230 ap PHN0eWxlPgpAZm9udC1mYWNlIHsKICBmb250LWZhbWlseTogbGFyZ2UtZm9udDsKICBzcmM6IGxv Y2FsKEFoZW0pLCB1cmwoaHR0cHM6Ly93cHQubGl2ZS9mb250cy9BaGVtLnR0Zik7CiAgc2l6ZS1h ZGp1c3Q6IDEwMDAlOwogIHVuaWNvZGUtcmFuZ2U6IFUrMDAyMDsKfQoKLnRlc3QgewogIGZvbnQt ZmFtaWx5OiBsYXJnZS1mb250Owp9Cjwvc3R5bGU+CjxzcGFuIGNsYXNzPSJ0ZXN0Ij5YPC9zcGFu Pgo=