This issue is applicable to N’Ko.

The World Organization for the Development of N'Ko prefers that all tone marks should appear at the same height above the baseline, rather than changing height according to the height of the base character to which they are attached. This image shows the preferred behaviour.

More: - [N'Ko Layout Requirements, Context-based shaping & positioning](https://www.w3.org/TR/nkoo-lreq/#context)

The GAP (2023)

The Noto Sans NKo font varies the height of the tone mark according to what it rests on. (The other major N'Ko Unicode fonts, Ebrima, Conakry, and Kigelia place tones at the same height.)

More: - [ N'ko Context-based shaping & positioning: Diacritic placement #30 ](https://github.com//issues/30)

Priority

Although this is the preference, the text is still readable, so this is marked as Advanced.

Tests & results

Character app test. Install the latest Noto Sans Nko font. Open the page and select Noto Sans NKo from the 'Current font' pulldown. Test passes if both tone marks are at the same height.

Action taken

Issue, Noto

Outcomes

The latest release of the Noto N'Ko fonts now set above marks at a constant height. This means that all major N'Ko fonts now behave as expected.