233447 2021-11-23 08:01:56 -0800 Consonant clusters with a visible virama should only have the first consonant+virama highlighted 2021-12-01 12:21:00 -0800 1 1 1 Unclassified WebKit Layout and Rendering Safari 15 Unspecified Unspecified NEW InRadar P2 Normal --- 1 ishida webkit-unassigned bfulgham ishida mmaxfield simon.fraser webkit-bug-importer zalan oldest_to_newest 1817474 0 ishida 2021-11-23 08:01:56 -0800 When the start of a line contains a 2-consonant cluster that uses a *visible* virama, ::first-letter should highlight only the first consonant+virama. This corresponds to a grapheme cluster, as defined by Unicode. Tests & results: Interactive test, When ::first-letter is applied to Devanagari the browser will NOT select a 2-consonant cluster as a unit if the virama is visible https://github.com/w3c/line_paragraph_tests/issues/68 Interactive test, When ::first-letter is applied to Bengali the browser will only select the first consonant+virama in a cluster if the virama is visible https://github.com/w3c/line_paragraph_tests/issues/70 Interactive test: When ::first-letter is applied to Tamil the browser will only select the first consonant+virama in a cluster if the virama is visible https://github.com/w3c/line_paragraph_tests/issues/71 For Devanagari and Bengali, Gecko only highlights the initial character+virama, whereas Blink, and Webkit select all clusters as a single unit, whether or not they are conjuncts or are rendered with a visible virama. For Tamil, all browsers select only the first grapheme cluster (as expected). WebKit browsers should not select the full consonant cluster if the virama is showing. 1817475 1 ishida 2021-11-23 08:03:41 -0800 For additional background information, see https://www.w3.org/International/questions/qa-indic-graphemes.en 1818733 2 webkit-bug-importer 2021-11-30 08:02:20 -0800 <rdar://problem/85865506> 1819235 3 ishida 2021-12-01 07:54:16 -0800 There's a bug report for Firefox at https://bugzilla.mozilla.org/show_bug.cgi?id=1742626 which, though not exactly the same problem, contains a lot of useful discussion around the general problem of correctly segmenting clusters with viramas. 1819359 4 mmaxfield 2021-12-01 12:21:00 -0800 Cool, thanks for the link.