[aaronrobertshaw]

Backport of Gutenberg PRs

• Border: Add a PHP helper for block support classes and styles gutenberg#84207,
• Shadow: Add a PHP helper for block support classes and styles gutenberg#84205,
• Spacing: Add a PHP helper for block support classes and styles gutenberg#84208,
• Colour: Add a PHP helper for block support classes and styles gutenberg#84206 and
• Background: Add a PHP helper for block support classes and styles gutenberg#84209

Trac ticket: https://core.trac.wordpress.org/ticket/66269

Adds PHP helpers that turn block attributes into a block support's classes and styles, like the JS get*ClassesAndStyles() functions, and moves the block supports onto them.

This PR backports:

• wp_get_border_classes_and_styles(), wp_get_shadow_classes_and_styles(), wp_get_spacing_classes_and_styles(), wp_get_color_classes_and_styles() and wp_get_background_classes_and_styles(),
• wp_apply_border_support(), wp_apply_shadow_support(), wp_apply_spacing_support(), wp_apply_colors_support() and wp_render_background_support() built on them,
• and the accompanying block supports tests.

The block changes that call these helpers (Avatar, Post Featured Image, Icon, Post Navigation Link, Navigation Submenu, Comment Author Avatar, Calendar and Button) arrive later with the Gutenberg package update.

Testing instructions

The block support output should be identical to trunk. The one exception: a null, false, empty or zero preset color now falls back to the custom color, as in JS. To compare, register a dynamic test block and render it on trunk and on this branch:

npm run env:cli -- eval "register_block_type( 'test/helpers', array( 'api_version' => 3, 'supports' => array( 'color' => array( 'text' => true, 'background' => true ), '__experimentalBorder' => array( 'color' => true, 'radius' => true, 'style' => true, 'width' => true ), 'shadow' => true, 'spacing' => array( 'padding' => true, 'margin' => true ), 'background' => array( 'backgroundImage' => true, 'gradient' => true ) ), 'render_callback' => static function () { return '<div ' . get_block_wrapper_attributes() . '></div>'; } ) ); echo do_blocks( '<!-- wp:test/helpers {\"borderColor\":\"contrast\",\"textColor\":\"base\",\"backgroundColor\":\"accent\",\"style\":{\"border\":{\"radius\":\"8px\",\"width\":\"2px\",\"style\":\"solid\",\"top\":{\"width\":\"4px\",\"color\":\"#3858e9\",\"style\":\"dashed\"}},\"shadow\":\"6px 6px 9px #00000033\",\"spacing\":{\"padding\":{\"top\":\"20px\",\"left\":\"var:preset|spacing|40\"},\"margin\":{\"top\":\"10px\"}},\"background\":{\"backgroundImage\":{\"url\":\"https://example.com/image.jpg\"},\"backgroundSize\":\"contain\"}}} /-->' );"

Both branches output:

<div style="border-radius:8px;border-style:solid;border-width:2px;border-top-width:4px;border-top-color:#3858e9;border-top-style:dashed;padding-top:20px;padding-left:var(--wp--preset--spacing--40);margin-top:10px;box-shadow:6px 6px 9px #00000033;background-image:url(&apos;https://example.com/image.jpg&apos;);background-position:50% 50%;background-size:contain;" class="wp-block-test-helpers has-text-color has-base-color has-background has-accent-background-color has-border-color has-contrast-border-color"></div>

Use of AI

AI assistance: Yes
Tool(s): Claude Code
Model(s): Claude Opus 5.5
Used for: the port from Gutenberg and the tests; I reviewed and edited them.

[github-actions]

Test using WordPress Playground

The changes in this pull request can previewed and tested using a WordPress Playground instance.

WordPress Playground is an experimental project that creates a full WordPress instance entirely within the browser.

Some things to be aware of

• All changes will be lost when closing a tab with a Playground instance.
• All changes will be lost when refreshing the page.
• A fresh instance is created each time the link below is clicked.
• Every time this pull request is updated, a new ZIP file containing all changes is created. If changes are not reflected in the Playground instance,
  it's possible that the most recent build failed, or has not completed. Check the list of workflow runs to be sure.

For more details about these limitations and more, check out the Limitations page in the WordPress Playground documentation.

Test this pull request with WordPress Playground.

[aaronrobertshaw]

I've been held up on some other priorities so this one will now be aimed for WP 7.3

[github-actions]

The following accounts have interacted with this PR and/or linked issues. I will continue to update these lists as activity occurs.

Core Committers: Use this line as a base for the props when committing in SVN:

Props aaronrobertshaw, westonruter.

To understand the WordPress project's expectations around crediting contributors, please review the Contributor Attribution page in the Core Handbook.

---

Props Bot commands

You can trigger Props Bot actions by commenting on this PR:

• @propsbot add <username> to give props to a GitHub user. Requires write access.
• @propsbot remove <username> to leave a user out of the props. Requires write access.
• @propsbot refresh to refresh this list. Adding the props-bot label works too.