Block support: Add server-side processing for ariaLabel

[t-hamano]

What?

• Closes Block API: Improve ariaLabel block support #68764
• Follow-up Block support: Preserve aria-label value in comment delimiter #69002
• Core backport PR: Block support: Add server-side processing for ariaLabel wordpress-develop#8274

Why?

In #69002, we updated the schema and added a migration to change the attribute value to a comment delimiter so that the ariaLabel block support would work in dynamic blocks.

However, because server-side processing was missing, this support did not work properly in blocks that used the ServerSideRender component, for example.

How?

Like many other block supports, add block support via the register method.

Testing Instructions

Here we will test adding ariaLabel support to the archive block.

First, make the following changes:

Diff

diff --git a/packages/block-library/src/archives/block.json b/packages/block-library/src/archives/block.json
index 0351a4b694..80e037e390 100644
--- a/packages/block-library/src/archives/block.json
+++ b/packages/block-library/src/archives/block.json
@@ -25,6 +25,7 @@
                }
        },
        "supports": {
+               "ariaLabel": true,
                "align": true,
                "__experimentalBorder": {
                        "radius": true,
diff --git a/packages/block-library/src/archives/index.php b/packages/block-library/src/archives/index.php
index 2846b6ca1a..6ef5190a66 100644
--- a/packages/block-library/src/archives/index.php
+++ b/packages/block-library/src/archives/index.php
@@ -89,7 +89,7 @@ function render_block_core_archives( $attributes ) {
 
        $archives = wp_get_archives( $archives_args );
 
-       $wrapper_attributes = get_block_wrapper_attributes( array( 'class' => $class ) );
+       $wrapper_attributes = get_block_wrapper_attributes( array( 'class' => $class, 'aria-label' => $attributes['ariaLabel'] ) );
 
        if ( empty( $archives ) ) {
                return sprintf(

In the post content, insert the following HTML:

<!-- wp:archives {"ariaLabel":"Archive Block Aria Label"} /-->

Confirm that the aria-label attribute is added to the block in both the frontend and the editor.

In the trunk branch, you’ll get an error like this:

[github-actions]

Flaky tests detected in f97978a.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/13199665831
📝 Reported issues:

• [Flaky Test] Redirection after template creation #60678 in /test/e2e/specs/site-editor/site-editor-url-navigation.spec.js
• [Flaky Test] should show the original content after revert, clicking undo then redo in the header toolbar #47896 in /test/e2e/specs/site-editor/template-revert.spec.js

[t-hamano]

This unit test is identical to the test in the core backport PR:
https://github.com/WordPress/wordpress-develop/pull/8274/files#diff-0f32f800b7e03fe08c378308dfb322156ea606714e2f39d095971d02add72a93

On the other hand, the following unit test cannot be included in this PR because it will not pass unless the aria-label attribute is allowed by default in the get_block_wrapper_attributes function:
https://github.com/WordPress/wordpress-develop/pull/8274/files#diff-699d565e390f7fb85d4d1c7ade8706b63fe2cec31043e8e18117961ca3f7083d

[github-actions]

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Co-authored-by: t-hamano <[email protected]>
Co-authored-by: aaronrobertshaw <[email protected]>
Co-authored-by: fabiankaegy <[email protected]>
Co-authored-by: Mamaduka <[email protected]>

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[aaronrobertshaw]

Appreciate the ping for review @t-hamano 👍

Unfortunately, my bandwidth is still limited for the time being, such that I won't be able to assist with reviews or testing here. I believe @tellthemachines is also in the same boat, so I've removed us both from the list of reviewers.

It might be worth pinging a few more people to get enough eyes on this PR.

[t-hamano]

Thank you for your reply. Just to be sure, I would like to ping @WordPress/gutenberg-core, not specific people.