[csswg-drafts] [css-color] Add note for text opacity applied to cursive scripts (#5139)

xfq has just created a new issue for https://github.com/w3c/csswg-drafts:

== [css-color] Add note for text opacity applied to cursive scripts ==
https://drafts.csswg.org/css-color-4/#transparency

In some scripts, the letters are connected at the base, and fonts achieve joining by overlapping letters. Making each letter transparent can expose these overlapping joinings, which should be avoided. It would be useful to add some guidance on alpha compositing for cursive scripts to the [Transparency](https://drafts.csswg.org/css-color-4/#transparency) section for implementations.

For more background information:

* [alreq ยง 3.4.7.2 Transparency](https://w3c.github.io/alreq/#h_joining_and_transparency)
* [i18n tests on text opacity](https://w3c.github.io/i18n-tests/results/cursive#text_opacity)


Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/5139 using your GitHub account

Received on Saturday, 30 May 2020 02:44:33 UTC