Incorrect placement of bopomofo tone marks in vertical writing mode

Issue #16525660 • Unassigned


Kevin H.
Mar 22, 2018
This issue is public.
Found in
  • Microsoft Edge
Standard affected
CSS Writing Modes Level 3

Reported by 1 person

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Steps to reproduce

Edge doesn’t place bopomofo tone marks next to ruby annotations correctly when the tone mark’s position is adjusted using OpenType features ‘vkrn’ or 'vert’.

Steps to Reproduce:
Open the test cases:
‘vkrn’ test case:
‘vert’ test case:

Expected Results:
Tone marks placed to the right of the ruby annotation, as seen in Firefox 59 or Chrome 65 (screenshots attached).

Actual Results:
Tone marks appear far underneath the ruby annotation in an incorrect orientation. There is also too much spacing to around the ruby annotation’s characters (screenshot attached).


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