217047 2020-09-28 02:26:17 -0700 document.fonts.ready is resolved too quickly in first run of module 2021-08-09 17:51:27 -0700 1 1 1 Unclassified WebKit CSS Safari 14 Mac Unspecified REOPENED https://bugs.webkit.org/show_bug.cgi?id=174030 https://bugs.webkit.org/show_bug.cgi?id=225790 InRadar P2 Normal --- 1 andreas webkit-unassigned andreas cdumez ggaren heycam mmaxfield rniwa tetsuharu.ohzeki webkit-bug-importer youennf oldest_to_newest 1692502 0 409874 andreas 2020-09-28 02:26:17 -0700 Created attachment 409874 Test which measures the width of a textual element in a loaded font. document.fonts.ready is resolved too quickly when run inside a module the first time the page is loaded. On subsequent reloads the font is effectively ready (cached?). The attachment demonstrates this by loading a (Google) font and trying to determine the width of a span filled with text. The first time the page is loaded the width returned is the one from 'monospace' font and not the loaded one. On second reload the returned width is correct. 1692998 1 webkit-bug-importer 2020-09-29 10:31:35 -0700 <rdar://problem/69753368> 1693791 2 tetsuharu.ohzeki 2020-10-01 10:40:19 -0700 I'm not confident that, but I seem this has been fixed at least in rev 267835 which I downloaded from https://webkit.org/build-archives/ for macOS Catalina and launch by run-webkit-archive. 1693877 3 mmaxfield 2020-10-01 14:19:42 -0700 Cool, thanks! I'll close this then. 1694506 4 andreas 2020-10-04 02:07:59 -0700 I just tested it with the provided test example:https://bugs.webkit.org/attachment.cgi?id=409874 and it's not resolved. I suggest to re-open the issue and to test it with the provided example (comments are inside the source code). 1694514 5 youennf 2020-10-04 02:46:42 -0700 Andreas, which Safari version did you try it? Is it reproducing in the latest Safari Tech Preview? 1694515 6 andreas 2020-10-04 02:49:11 -0700 I just tested it in rev 267835 as suggested by tetsuharu.ohzeki@gmail.com I had to adapt the test as I wasn't able to access the inspector: so the output had to be rendered into the DOM instead of console. But it failed (first run only, subsequent runs are ok). 1694516 7 youennf 2020-10-04 02:50:07 -0700 Thanks for the confirmation 1694517 8 andreas 2020-10-04 02:51:46 -0700 I also just tested it in Safari Tech Preview rel. 113 without success. 1695965 9 tetsuharu.ohzeki 2020-10-08 11:09:53 -0700 I confirm Safari TP 114 (rev 265893-267325) has not fixed yet. Some commits after rev 267325 would fix this. 1695975 10 rniwa 2020-10-08 11:29:50 -0700 Can we add a test so that this won't regress again in the future? 1696238 11 410942 tetsuharu.ohzeki 2020-10-09 09:30:54 -0700 Created attachment 410942 WIP minimum testcase I edit the test case to make it minimum. I confirm this would fails in Safari 14.0 but this passes on the Mini Browser (rev 268202) built on my local machine. 1696241 12 tetsuharu.ohzeki 2020-10-09 09:35:43 -0700 (In reply to Tetsuharu Ohzeki from comment #11) > Created attachment 410942 [details] > WIP minimum testcase > > I edit the test case to make it minimum. I confirm this would fails in > Safari 14.0 but this passes on the Mini Browser (rev 268202) built on my > local machine. With MiniBrowser launched by run-minibrowser, I reset caches by menu's "Debug" -> "Clear WebSite Data". I seem this bug is fixed bug in the latest trunk. However, sadly, this bug is reproduce randomly even if with the latest trunk's MiniBrowser. After clearing caches, reloading the page multiple times, this bug sometimes reproduce. 1702291 13 412523 tetsuharu.ohzeki 2020-10-28 06:19:30 -0700 Created attachment 412523 WIP minimum testcase 1702292 14 412523 tetsuharu.ohzeki 2020-10-28 06:24:10 -0700 Comment on attachment 412523 WIP minimum testcase View in context: https://bugs.webkit.org/attachment.cgi?id=412523&action=review > LayoutTests/fast/css/font-face-set-ready-regression-expected.txt:2 > +a: 1600 As an expected case, this should be 960. If the I ran this test manually in Safari/MiniBrowser with clearing caches, this will be 960. However, WebKitTestRunner will dump 1600. This is mysterious behavior but I don't have any good idea to reproduce this test in WebKitTestRunner too... Do you have any good idea? 1702294 15 tetsuharu.ohzeki 2020-10-28 06:31:34 -0700 Furthermore, I observe that this bug is reproducible again in Safari TP 115 running on both of macOS 10.15.7 and macOS 11.0 Beta (20A5395g). 1702299 16 tetsuharu.ohzeki 2020-10-28 06:41:10 -0700 (In reply to Tetsuharu Ohzeki from comment #15) > Furthermore, I observe that this bug is reproducible again in Safari TP 115 > running on both of macOS 10.15.7 and macOS 11.0 Beta (20A5395g). I tested them with the original test case (attachment 409874) 1702359 17 tetsuharu.ohzeki 2020-10-28 10:14:05 -0700 With the WIP minimum testcase (attachment 412523), I confirmed followings with rev 269096: * This is reproducible on MiniBrowser with release build. * But this is not reproducible on MiniBrowser with debug build. 409874 2020-09-28 02:26:17 -0700 2020-09-28 02:26:17 -0700 Test which measures the width of a textual element in a loaded font. fonts_read_test.html text/html 1947 andreas PCFET0NUWVBFIGh0bWw+CjxodG1sIGxhbmc9ImVuIiA+CjxoZWFkPgoJPG1ldGEgY2hhcnNldD0i dXRmLTgiPgoJPHRpdGxlPmZvbnRzLnJlYWR5IHRlc3Q8L3RpdGxlPgoJCTxsaW5rIGhyZWY9Imh0 dHBzOi8vZm9udHMuZ29vZ2xlYXBpcy5jb20vY3NzMj9mYW1pbHk9Um9ib3RvK01vbm86d2dodEAx MDAmZGlzcGxheT1zd2FwIiByZWw9InN0eWxlc2hlZXQiPgoJCTwhLS0KCQk8c3R5bGU+QGltcG9y dCB1cmwoJ2h0dHBzOi8vZm9udHMuZ29vZ2xlYXBpcy5jb20vY3NzMj9mYW1pbHk9Um9ib3RvK01v bm86d2dodEAxMDAmZGlzcGxheT1zd2FwJyk7PC9zdHlsZT4KCQktLT4KCQk8c3R5bGUgdHlwZT0i 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