The ordered (numbered) list option in the text web part has inadequate options. Users are restricted to a single list-style-type option - upper-roman (1, 2, 3, etc) for those of you who know CSS for a first level list.

It looks like lower-alpha kicks in if a list item is indented after the first level, but that might be something that's carried over from copied and pasted text.

I don't believe there are any hard and fast rules in html or css that dictate that upper-roman must always be used for first level lists on web pages.

I think its reasonable for users to expect they can select their preferred style for numbered lists on their SharePoint pages just the same as they do in Word. After all, this is the app that most people use when they are drafting their page content.

My users are currently forced to use the indent tool (which in code makes the text a <blockquote>) and type in their preferred number style. This means the page no longer meets WCAG requirements as the text is not semantically correct.

Please upgrade text web part so that users can select their preferred 'number' style for ordered lists, and also if possible choose where to start the numbering (the "start" attribute is valid in HTML 5).

For reference the most commonly used ordered list style types in my users content are:
decimal
decimal-leading-zero
lower-roman
upper-roman
lower-alpha
upper-alpha