L2/20-060

To:      Unicode Technical Committee
From:    Sarabveer Singh (me@sarabveer.me)
Date:    28 January 2020

Subject: Feedback on Gurmukhi Bindi Before Bihari (L2/18-319, L2/19-167, L2/19-283)

Singh in L2/18-319 and L2/19-167 wishes for the Unicode specification to add
support for GURMUKHI SIGN BINDI and GURMUKHI TIPPI to display before
GURMUKHI VOWEL SIGN II. As noted in L2/19-047, this combination is most
likely to be a stylistic difference.

However, this combination should be supported as a stylistic option in
Unicode fonts. In testing, I have only found the "liga" and/or the "rlig"
OpenType lookups display this stylistic combination. This is an unsupported
method and does not work universally on different systems. In my experience,
the ligature displays correctly in the major web browsers (Google Chrome,
Mozilla Firefox, Apple Safari), but they do not display correctly in
Microsoft's software (Office, Edge, Internet Explorer).

I request that a OpenType Ligature Lookup Table be recommend to implement
this stylistic combination in Unicode fonts, such as the "abvf" Lookup
Table.

-o-