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 not all browsers support text-combine-upright applied to counters.

A workaround might be to use fullwidth characters for counters, such as ①, ②, ③ etc., but use of such a workaround requires the availability of custom built counter styles, and not all browsers currently support the CSS Counter Styles specification. So that doesn't work either.

It is a significant nuisance for content authoring to not be able to produce upright counters for lists.

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