Add box shadow support to blocks (using code editor for now).

lib/block-supports/shadow.php

@@ -0,0 +1,80 @@
+<?php
+/**
+ * Shadow block support flag.
+ *
+ * @package gutenberg
+ */
+
+/**
+ * Registers the style and shadow block attributes for block types that support it.
+ *
+ * @param WP_Block_Type $block_type Block Type.
+ */
+function gutenberg_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.
+ *
+ * @param  WP_Block_Type $block_type       Block type.
+ * @param  array         $block_attributes Block attributes.
+ *
+ * @return array Shadow CSS classes and inline styles.
+ */
+function gutenberg_apply_shadow_support( $block_type, $block_attributes ) {
+	if ( ! property_exists( $block_type, 'supports' ) ) {
+		return array();
+	}
+
+	$has_shadow_support = _wp_array_get( $block_type->supports, 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     = gutenberg_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' => 'gutenberg_register_shadow_support',
+		'apply'              => 'gutenberg_apply_shadow_support',
+	)
+);

lib/compat/wordpress-6.2/blocks.php

@@ -20,6 +20,7 @@ function gutenberg_safe_style_attrs_6_2( $attrs ) {
 	$attrs[] = 'bottom';
 	$attrs[] = 'left';
 	$attrs[] = 'z-index';
+	$attrs[] = 'box-shadow';
 
 	return $attrs;
 }

lib/load.php

@@ -137,3 +137,4 @@ function gutenberg_is_experiment_enabled( $name ) {
 require __DIR__ . '/block-supports/spacing.php';
 require __DIR__ . '/block-supports/dimensions.php';
 require __DIR__ . '/block-supports/duotone.php';
+require __DIR__ . '/block-supports/shadow.php';

packages/style-engine/class-wp-style-engine.php

@@ -136,6 +136,17 @@ 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(