Customisable counters are needed for many languages.

There is no way for users to create local counter styles that are not built in to the browser, and users also often want to tweak the counter style in some way (esp. the prefix/suffix).

Ethiopic script text uses local counter styles. While some of these are supported by some browsers, the set of symbols used and their order varies by language, and not all are supported.

FIXED !

This gap is now fixed. For more details, see this GitHub issue, which is being used to track this gap. Please add any discussion there, and not to this issue.