diff -r 7b1b88e27a20 -r 48c4eec2b7e6 wp/wp-includes/block-supports/settings.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/wp/wp-includes/block-supports/settings.php	Fri Sep 05 18:40:08 2025 +0200
@@ -0,0 +1,152 @@
+<?php
+/**
+ * Block level presets support.
+ *
+ * @package WordPress
+ * @since 6.2.0
+ */
+
+/**
+ * Get the class name used on block level presets.
+ *
+ * @internal
+ *
+ * @since 6.2.0
+ * @access private
+ *
+ * @param array $block Block object.
+ * @return string      The unique class name.
+ */
+function _wp_get_presets_class_name( $block ) {
+	return 'wp-settings-' . md5( serialize( $block ) );
+}
+
+/**
+ * Update the block content with block level presets class name.
+ *
+ * @internal
+ *
+ * @since 6.2.0
+ * @access private
+ *
+ * @param  string $block_content Rendered block content.
+ * @param  array  $block         Block object.
+ * @return string                Filtered block content.
+ */
+function _wp_add_block_level_presets_class( $block_content, $block ) {
+	if ( ! $block_content ) {
+		return $block_content;
+	}
+
+	// return early if the block doesn't have support for settings.
+	$block_type = WP_Block_Type_Registry::get_instance()->get_registered( $block['blockName'] );
+	if ( ! block_has_support( $block_type, '__experimentalSettings', false ) ) {
+		return $block_content;
+	}
+
+	// return early if no settings are found on the block attributes.
+	$block_settings = isset( $block['attrs']['settings'] ) ? $block['attrs']['settings'] : null;
+	if ( empty( $block_settings ) ) {
+		return $block_content;
+	}
+
+	// Like the layout hook this assumes the hook only applies to blocks with a single wrapper.
+	// Add the class name to the first element, presuming it's the wrapper, if it exists.
+	$tags = new WP_HTML_Tag_Processor( $block_content );
+	if ( $tags->next_tag() ) {
+		$tags->add_class( _wp_get_presets_class_name( $block ) );
+	}
+
+	return $tags->get_updated_html();
+}
+
+/**
+ * Render the block level presets stylesheet.
+ *
+ * @internal
+ *
+ * @since 6.2.0
+ * @since 6.3.0 Updated preset styles to use Selectors API.
+ * @access private
+ *
+ * @param string|null $pre_render   The pre-rendered content. Default null.
+ * @param array       $block The block being rendered.
+ *
+ * @return null
+ */
+function _wp_add_block_level_preset_styles( $pre_render, $block ) {
+	// Return early if the block has not support for descendent block styles.
+	$block_type = WP_Block_Type_Registry::get_instance()->get_registered( $block['blockName'] );
+	if ( ! block_has_support( $block_type, '__experimentalSettings', false ) ) {
+		return null;
+	}
+
+	// return early if no settings are found on the block attributes.
+	$block_settings = isset( $block['attrs']['settings'] ) ? $block['attrs']['settings'] : null;
+	if ( empty( $block_settings ) ) {
+		return null;
+	}
+
+	$class_name = '.' . _wp_get_presets_class_name( $block );
+
+	// the root selector for preset variables needs to target every possible block selector
+	// in order for the general setting to override any bock specific setting of a parent block or
+	// the site root.
+	$variables_root_selector = '*,[class*="wp-block"]';
+	$registry                = WP_Block_Type_Registry::get_instance();
+	$blocks                  = $registry->get_all_registered();
+	foreach ( $blocks as $block_type ) {
+		/*
+		 * We only want to append selectors for blocks using custom selectors
+		 * i.e. not `wp-block-<name>`.
+		 */
+		$has_custom_selector =
+			( isset( $block_type->supports['__experimentalSelector'] ) && is_string( $block_type->supports['__experimentalSelector'] ) ) ||
+			( isset( $block_type->selectors['root'] ) && is_string( $block_type->selectors['root'] ) );
+
+		if ( $has_custom_selector ) {
+			$variables_root_selector .= ',' . wp_get_block_css_selector( $block_type );
+		}
+	}
+	$variables_root_selector = WP_Theme_JSON::scope_selector( $class_name, $variables_root_selector );
+
+	// Remove any potentially unsafe styles.
+	$theme_json_shape  = WP_Theme_JSON::remove_insecure_properties(
+		array(
+			'version'  => WP_Theme_JSON::LATEST_SCHEMA,
+			'settings' => $block_settings,
+		)
+	);
+	$theme_json_object = new WP_Theme_JSON( $theme_json_shape );
+
+	$styles = '';
+
+	// include preset css variables declaration on the stylesheet.
+	$styles .= $theme_json_object->get_stylesheet(
+		array( 'variables' ),
+		null,
+		array(
+			'root_selector' => $variables_root_selector,
+			'scope'         => $class_name,
+		)
+	);
+
+	// include preset css classes on the the stylesheet.
+	$styles .= $theme_json_object->get_stylesheet(
+		array( 'presets' ),
+		null,
+		array(
+			'root_selector' => $class_name . ',' . $class_name . ' *',
+			'scope'         => $class_name,
+		)
+	);
+
+	if ( ! empty( $styles ) ) {
+		wp_enqueue_block_support_styles( $styles );
+	}
+
+	return null;
+}
+
+add_filter( 'render_block', '_wp_add_block_level_presets_class', 10, 2 );
+add_filter( 'pre_render_block', '_wp_add_block_level_preset_styles', 10, 2 );