290996 2025-04-03 07:48:40 -0700 [GTK] Emoji displayed in text mode in Webkit, but with colour in Firefox/Chromium 2025-06-25 07:06:05 -0700 1 1 1 Unclassified WebKit WebKitGTK WebKit Nightly Build PC Linux RESOLVED DUPLICATE 294966 https://bugs.webkit.org/show_bug.cgi?id=259205 Gtk, InRadar P3 Normal --- 1 dpa-webkit webkit-unassigned andresg_22 bugs-noreply guillaume.webkit mcatanzaro webkit-bug-importer oldest_to_newest 2108503 0 474816 dpa-webkit 2025-04-03 07:48:40 -0700 Created attachment 474816 Sample with emoji with(out) colour Loading https://cal.aegee.org/s/0/e947872a-224b-4c84-8d25-90a541a9ec6-318.ics_en.html (the attached file) with webkitgtk-6.0/MiniBrowser 2.48.0, webkit2gtk-4.1/MiniBrowser 2.48.0 and Epiphany 46.3 shows the island on the first line in text mode, but loading the same file with Chromium or Firefox on Linux shows the island in colour. Cf: https://gitlab.gnome.org/GNOME/evolution/-/issues/3031 Emoji code f0 9f 8f 9d Desert Island. Actual text under hexdump 000028d0 61 0d 0a 53 55 4d 4d 41 52 59 3a 4e 57 4d 3a 20 |a..SUMMARY:NWM: | 000028e0 50 65 73 63 61 72 61 5c 2c 20 74 68 65 20 6e 65 |Pescara\, the ne| 000028f0 78 74 20 74 72 65 61 73 75 72 65 20 69 73 6c 61 |xt treasure isla| 00002900 6e 64 f0 9f 8f 9d ef b8 8f 20 21 0d 0a 55 49 44 |nd....... !..UID| 2108504 1 webkit-bug-importer 2025-04-03 07:48:49 -0700 <rdar://problem/148517738> 2108809 2 dpa-webkit 2025-04-04 00:54:54 -0700 When I click on an event at https://cal.aegee.org there is an Unicode clock followed by Unicode variation selector 15. So this clock should be in text-form (without colours). In MiniBrowser the clock in shown with colour, so the selector 15 is ignored, but in Firefox and Chromium on Linux there is no colour in the clock. That said, WebKit(GTK?) does not have correct understanding when Unicode variation selector 15 should be applied. Sometimes it is applied, when the selector it is missing, and sometimes selector 15 is present, but is not applied. 2111967 3 dpa-webkit 2025-04-18 23:17:23 -0700 N.B. after the island above is included expicit Unicode Variation Selector 16, which is supposed to enforce the colour form of the emoji. 2116496 4 mcatanzaro 2025-05-12 08:36:22 -0700 I see the old FontCascade::fontForCombiningCharacterSequence in FontCairoHarfbuzzNG.cpp has code to support color emoji, but the new FontCascade::fontForCombiningCharacterSequence in FontCascadeSkia.cpp notably does not. 2116508 5 mcatanzaro 2025-05-12 10:01:29 -0700 Possibly also related to bug #259205 2125766 6 mcatanzaro 2025-06-25 07:06:05 -0700 *** This bug has been marked as a duplicate of bug 294966 *** 474816 2025-04-03 07:48:40 -0700 2025-04-03 07:48:40 -0700 Sample with emoji with(out) colour sample_island.html text/html 6306 dpa-webkit PCFET0NUWVBFIGh0bWw+CjxodG1sIGxhbmc9ImVuIj48aGVhZD4KPG1ldGEgaHR0cC1lcXVpdj0i 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