1829071 - Upright text in vertical lines doesn't segment correctly

Status: NEW

(Core :: Layout: Text and Fonts, defect, P3)

Description

[Fuqiao Xue [:xfq]]

Steps to reproduce:

Tests & results:
When devanagari characters are rendered upright in vertical text, orthographic syllables containing conjuncts are kept together: https://github.com/w3c/text_direction_tests/issues/10

Actual results:

Gecko appears to segment on grapheme clusters, but has problems with vowel-signs, especially but not only pre-base vowel-signs.

Expected results:

See requirements at: Indic Layout Requirements, but add to those the points made in https://w3c.github.io/i18n-drafts/questions/qa-indic-graphemes.en.html

Comment 1

[Fuqiao Xue [:xfq]]

Here's a link to the Indic Layout Requirements: https://w3c.github.io/ilreq/#h_vertical_arrangements_of_characters