fix: role for section element with no accessible name

[jlp-craigmorten]

Changes

Relates to #25

Updates the role returned for a section element to be either:

1. region when the element has an accessible name;
2. generic otherwise.

How to Review

Mirrors the existing functionality and tests for the img element which has similar behaviours.

According to specification a title attribute can also be used for the accessible name - I have opted to follow precedent set by the img behaviour to not include this (indeed there is prior art for ignoring the title attribute in other pages IIRC as something seen as poor practice).

Checklist

• Unit tests updated

[drwpow]

Wonderful, thank you! Thanks for the added details of comment and test cleanups too. Much appreciated. No notes 🙂