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Improve table caption accessibility #41980

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Improve table caption accessibility #41980

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@Soean Soean commented Jun 27, 2022

What?

This PR improves the Table markup for better A11y:
Fixes #41502

Old:

<figure class="wp-block-table">
    <table>
        <tbody>
            <tr>
                <td>1</td>
                <td>2</td>
            </tr>
            <tr>
                <td>3</td>
                <td>4</td>
            </tr>
        </tbody>
    </table>
    <figcaption>Test</figcaption>
</figure>

New:

<table class="wp-block-table">
    <caption>Test</caption>
    <tbody>
        <tr>
            <td>1</td>
            <td>2</td>
        </tr>
        <tr>
            <td>3</td>
            <td>4</td>
        </tr>
    </tbody>
</table>

Testing Instructions

Paste this code in the editor. The old content should be migrated to the new content:

<!-- wp:heading -->
<h2>Old</h2>
<!-- /wp:heading -->

<!-- wp:table -->
<figure class="wp-block-table"><table><tbody><tr><td>1</td><td>2</td></tr><tr><td>3</td><td>4</td></tr></tbody></table><figcaption class="wp-element-caption">Test</figcaption></figure>
<!-- /wp:table -->

<!-- wp:table {"align":"wide","className":"my-special-class"} -->
<figure class="wp-block-table alignwide my-special-class" id="my-anchor"><table><tbody><tr><td class="has-text-align-center" data-align="center">A</td><td>B</td></tr><tr><td class="has-text-align-center" data-align="center">C</td><td>D</td></tr></tbody></table><figcaption class="wp-element-caption">My Caption</figcaption></figure>
<!-- /wp:table -->

<!-- wp:heading -->
<h2>New</h2>
<!-- /wp:heading -->

<!-- wp:table -->
<table class="wp-block-table"><caption class="wp-element-caption">Test</caption><tbody><tr><td>1</td><td>2</td></tr><tr><td>3</td><td>4</td></tr></tbody></table>
<!-- /wp:table -->

<!-- wp:table {"align":"wide","style":{"className":"my-special-class"} -->
<table class="wp-block-table alignwide my-special-class" id="my-anchor"><caption class="wp-element-caption">My Caption</caption><tbody><tr><td class="has-text-align-center" data-align="center">A</td><td>B</td></tr><tr><td class="has-text-align-center" data-align="center">C</td><td>D</td></tr></tbody></table>
<!-- /wp:table -->

@Soean Soean added [Focus] Accessibility (a11y) Changes that impact accessibility and need corresponding review (e.g. markup changes). [Block] Table Affects the Table Block labels Jun 27, 2022
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Size Change: +135 B (0%)

Total Size: 1.25 MB

Filename Size Change
build/block-library/index.min.js 184 kB +135 B (0%)
ℹ️ View Unchanged
Filename Size
build/a11y/index.min.js 982 B
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@Soean Soean marked this pull request as ready for review June 27, 2022 14:07
@Soean Soean requested a review from ajitbohra as a code owner June 27, 2022 14:07
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@talldan talldan left a comment

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I guess this PR still has some way to go. Styles seem to be broken and the markup in the edit.js file still needs to be updated, so not sure if this is too early to leave a review.

I'm supportive of any change to improve accessibility, but it's worth pointing out there were two more problems with using a rich text <caption> that weren't mentioned in #41502:

  • Tab order is incorrect because the caption element is before the table in the DOM, but after it visually.
  • Voiceover didn't announce rich text caption elements correctly when the table is focused. Potentially this may have been fixed in VO.

<Section type="body" rows={ body } />
<Section type="foot" rows={ foot } />
</table>
<table
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@talldan talldan Jun 28, 2022

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The <figure> element provided a horizontally scrolling container for wide tables, and without that wide tables now breakout of the layout. I think a div wrapper might be needed to replace that.

The markup in the editor now also doesn't match the frontend.

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[Block] Table Affects the Table Block [Focus] Accessibility (a11y) Changes that impact accessibility and need corresponding review (e.g. markup changes).
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Improve table caption accessibility
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