WordPress 6.3 backport: Add box shadow support to blocks

src/wp-includes/block-supports/shadow.php

@@ -0,0 +1,83 @@
+<?php
+/**
+ * Shadow block support flag.
+ *
+ * @package WordPress
+ * @since 6.3.0
+ */
+
+/**
+ * Registers the style and shadow block attributes for block types that support it.
+ *
+ * @since 6.3.0
+ * @access private
+ *
+ * @param WP_Block_Type $block_type Block Type.
+ */
+function wp_register_shadow_support( $block_type ) {
+	$has_shadow_support = block_has_support( $block_type, array( 'shadow' ), false );
+
+	if ( ! $has_shadow_support ) {
+		return;
+	}
+
+	if ( ! $block_type->attributes ) {
+		$block_type->attributes = array();
+	}
+
+	if ( $has_shadow_support && ! array_key_exists( 'style', $block_type->attributes ) ) {
+		$block_type->attributes['style'] = array(
+			'type' => 'object',
+		);
+	}
+
+	if ( $has_shadow_support && ! array_key_exists( 'shadow', $block_type->attributes ) ) {
+		$block_type->attributes['shadow'] = array(
+			'type' => 'string',
+		);
+	}
+}
+
+/**
+ * Add CSS classes and inline styles for shadow features to the incoming attributes array.
+ * This will be applied to the block markup in the front-end.
+ *
+ * @since 6.3.0
+ * @access private
+ *
+ * @param  WP_Block_Type $block_type       Block type.
+ * @param  array         $block_attributes Block attributes.
+ *
+ * @return array Shadow CSS classes and inline styles.
+ */
+function wp_apply_shadow_support( $block_type, $block_attributes ) {
+	$has_shadow_support = block_has_support( $block_type, array( 'shadow' ), false );
+
+	if ( ! $has_shadow_support ) {
+		return array();
+	}
+
+	$shadow_block_styles = array();
+
+	$preset_shadow                 = array_key_exists( 'shadow', $block_attributes ) ? "var:preset|shadow|{$block_attributes['shadow']}" : null;
+	$custom_shadow                 = isset( $block_attributes['style']['shadow'] ) ? $block_attributes['style']['shadow'] : null;
+	$shadow_block_styles['shadow'] = $preset_shadow ? $preset_shadow : $custom_shadow;
+
+	$attributes = array();
+	$styles     = wp_style_engine_get_styles( $shadow_block_styles );
+
+	if ( ! empty( $styles['css'] ) ) {
+		$attributes['style'] = $styles['css'];
+	}
+
+	return $attributes;
+}
+
+// Register the block support.
+WP_Block_Supports::get_instance()->register(
+	'shadow',
+	array(
+		'register_attribute' => 'wp_register_shadow_support',
+		'apply'              => 'wp_apply_shadow_support',
+	)
+);

src/wp-includes/kses.php

@@ -2447,6 +2447,7 @@ function safecss_filter_attr( $css, $deprecated = '' ) {
 			'bottom',
 			'left',
 			'z-index',
+			'box-shadow',
 			'aspect-ratio',
 
 			// Custom CSS properties.

src/wp-includes/style-engine/class-wp-style-engine.php

@@ -148,6 +148,17 @@ final class WP_Style_Engine {
 				),
 			),
 		),
+		'shadow'     => array(
+			'shadow' => array(
+				'property_keys' => array(
+					'default' => 'box-shadow',
+				),
+				'path'          => array( 'shadow' ),
+				'css_vars'      => array(
+					'shadow' => '--wp--preset--shadow--$slug',
+				),
+			),
+		),
 		'dimensions' => array(
 			'minHeight' => array(
 				'property_keys' => array(

src/wp-settings.php

@@ -331,6 +331,7 @@
 require ABSPATH . WPINC . '/block-supports/custom-classname.php';
 require ABSPATH . WPINC . '/block-supports/dimensions.php';
 require ABSPATH . WPINC . '/block-supports/duotone.php';
+require ABSPATH . WPINC . '/block-supports/shadow.php';
 require ABSPATH . WPINC . '/block-supports/elements.php';
 require ABSPATH . WPINC . '/block-supports/generated-classname.php';
 require ABSPATH . WPINC . '/block-supports/layout.php';

tests/phpunit/tests/block-supports/shadow.php

@@ -0,0 +1,89 @@
+<?php
+/**
+ * @group block-supports
+ *
+ * @covers ::wp_apply_shadow_support
+ */
+class Test_Block_Supports_Shadow extends WP_UnitTestCase {
+	/**
+	 * @var string|null
+	 */
+	private $test_block_name;
+
+	public function set_up() {
+		parent::set_up();
+		$this->test_block_name = null;
+	}
+
+	public function tear_down() {
+		unregister_block_type( $this->test_block_name );
+		$this->test_block_name = null;
+		parent::set_up();
+	}
+
+	/**
+	 * @ticket 58590
+	 */
+	public function test_shadow_style_is_applied() {
+		$this->test_block_name = 'test/shadow-style-is-applied';
+		register_block_type(
+			$this->test_block_name,
+			array(
+				'api_version' => 3,
+				'attributes'  => array(
+					'style' => array(
+						'type' => 'object',
+					),
+				),
+				'supports'    => array(
+					'shadow' => true,
+				),
+			)
+		);
+		$registry   = WP_Block_Type_Registry::get_instance();
+		$block_type = $registry->get_registered( $this->test_block_name );
+		$block_atts = array(
+			'style' => array(
+				'shadow' => '60px -16px teal',
+			),
+		);
+
+		$actual   = wp_apply_shadow_support( $block_type, $block_atts );
+		$expected = array(
+			'style' => 'box-shadow:60px -16px teal;',
+		);
+
+		$this->assertSame( $expected, $actual );
+	}
+
+	/**
+	 * @ticket 58590
+	 */
+	public function test_shadow_without_block_supports() {
+		$this->test_block_name = 'test/shadow-with-skipped-serialization-block-supports';
+		register_block_type(
+			$this->test_block_name,
+			array(
+				'api_version' => 2,
+				'attributes'  => array(
+					'style' => array(
+						'type' => 'object',
+					),
+				),
+				'supports'    => array(),
+			)
+		);
+		$registry   = WP_Block_Type_Registry::get_instance();
+		$block_type = $registry->get_registered( $this->test_block_name );
+		$block_atts = array(
+			'style' => array(
+				'shadow' => '60px -16px teal',
+			),
+		);
+
+		$actual   = wp_apply_spacing_support( $block_type, $block_atts );
+		$expected = array();
+
+		$this->assertSame( $expected, $actual );
+	}
+}

tests/phpunit/tests/style-engine/styleEngine.php

@@ -26,6 +26,7 @@ public function tear_down() {
 	 *
 	 * @ticket 56467
 	 * @ticket 58549
+	 * @ticket 58590
 	 *
 	 * @covers ::wp_style_engine_get_styles
 	 *
@@ -182,6 +183,19 @@ public function data_wp_style_engine_get_styles() {
 				),
 			),
 
+			'inline_valid_shadow_style'                    => array(
+				'block_styles'    => array(
+					'shadow' => 'inset 5em 1em gold',
+				),
+				'options'         => null,
+				'expected_output' => array(
+					'css'          => 'box-shadow:inset 5em 1em gold;',
+					'declarations' => array(
+						'box-shadow' => 'inset 5em 1em gold',
+					),
+				),
+			),
+
 			'inline_valid_typography_style'                => array(
 				'block_styles'    => array(
 					'typography' => array(