Add accessibility-ready testing docs

[joedolson]

Adds initial structure for the accessibility-ready guidelines.

Previews:

• Documenting accessibility: https://wpaccessibility.org/pr-preview/pr-253/docs/topics/documenting-accessibility/
• Theme accessibility guidelines: https://wpaccessibility.org/pr-preview/pr-253/docs/topics/theme-guidelines/
• Testing WordPress themes for accessibility: https://wpaccessibility.org/pr-preview/pr-253/docs/testing/testing-themes/

Please note:
Content committed without contacting the project leads @rianrietveld or @joedolson first, will not be reviewed.

The related issue number: #

Before submitting this PR, please make sure:

• One of the project leads assigned this task to you.
• You did not generate content using AI (artificial intelligence), except for translations or spelling checks.

If you submit code or documentation using a local build:

• Your code builds clean without any errors or warnings while running npm run test.
• You read the documentation in How to contribute to this documentation.
• You checked the modified pages with an accessibility tool like Axe Devtools or WAVE.

[github-actions]

PR Preview
Preview removed because the pull request was closed.
2026-01-14 17:59 UTC

[joedolson]

Changes requested below!

[amberhinds]

This PR closes: #164

It adds two new sections under Standards and best practice:

• Documenting Accessibility
• Theme accessibility guidelines

And one new section under Testing WordPress themes:

• Testing WordPress themes for accessibility

[rianrietveld]

Hey @amberhinds and @joedolson
What a tremendous amount of excellent work!

I propose this goes in as is, you have worked so long on this, let's just merge it.

No show stoppers, but for the future I would propose:

• Let testers take all steps and see if they understand everything, maybe a good task for a contributor day. It's a lot.
• Accessibility Conformance Reports: I miss WCAG-EM reporting, as we use in Europe, I will ping Hidde de Vries about this, for his input.
• With the guidelines: add links to the related topics on wpaccessibility.org, as soon they exist.
• Uniform the Notes as we do with the other docs.
• Maybe add the success criterion number, as we do with the related WCAG guidelines in the topics.

Thank you both 🧡