Unable to make list counters stand upright in vertical text

[r12a]

This issue is applicable to Chinese, Japanese, Korean, and Mongolian.

A common way to orient counters for lists in vertical text is to have an upright number with a dot alongside it.

The expected way to achieve this in HTML would be to use the following CSS: li::marker { text-combine-upright: all; }, however this cannot be used because browsers don't support text-combine-upright.

For more details, see this GitHub issue, which is being used to track this gap.

[r12a]

The first comment in this issue contains text that will automatically appear in the clreq gap-analysis document as a subsection with the same title as this issue. Any edits made to that comment will be immediately available in the document. Proposals for changes or discussion of the content can be made in comments below this point.