= WP_Block_Type_Registry::get_instance();
		$registered_block_types = $block_registry->get_all_registered();
		foreach ( $registered_block_types as $block_type ) {
			if ( ! ( $block_type instanceof WP_Block_Type ) ) {
				continue;
			}
			if ( ! $block_type->attributes ) {
				$block_type->attributes = array();
			}

			foreach ( $this->block_supports as $block_support_config ) {
				if ( ! isset( $block_support_config['register_attribute'] ) ) {
					continue;
				}

				call_user_func(
					$block_support_config['register_attribute'],
					$block_type
				);
			}
		}
	}
}

/**
 * Generates a string of attributes by applying to the current block being
 * rendered all of the features that the block supports.
 *
 * @since 5.6.0
 *
 * @param string[] $extra_attributes Optional. Array of extra attributes to render on the block wrapper.
 * @return string String of HTML attributes.
 */
function get_block_wrapper_attributes( $extra_attributes = array() ) {
	$new_attributes = WP_Block_Supports::get_instance()->apply_block_supports();

	if ( empty( $new_attributes ) && empty( $extra_attributes ) ) {
		return '';
	}

	// Attribute values are concatenated or overridden depending on the attribute type.
	// This is hardcoded on purpose, as we only support a fixed list of attributes.
	$attribute_merge_callbacks = array(
		'style'      => static function ( $new_attribute, $extra_attribute ) {
			$styles = array_filter(
				array(
					rtrim( trim( $new_attribute ), ';' ),
					rtrim( trim( $extra_attribute ), ';' ),
				)
			);
			return safecss_filter_attr( implode( ';', array_filter( $styles ) ) );
		},
		'class'      => static function ( $new_attribute, $extra_attribute ) {
			$classes = array_merge(
				(array) preg_split( '/\s+/', $extra_attribute, -1, PREG_SPLIT_NO_EMPTY ),
				(array) preg_split( '/\s+/', $new_attribute, -1, PREG_SPLIT_NO_EMPTY )
			);
			$classes = array_unique( $classes );
			return implode( ' ', $classes );
		},
		'id'         => static function ( $new_attribute, $extra_attribute ) {
			return '' !== $extra_attribute ? $extra_attribute : $new_attribute;
		},
		'aria-label' => static function ( $new_attribute, $extra_attribute ) {
			return '' !== $extra_attribute ? $extra_attribute : $new_attribute;
		},
	);

	// Accept strings and numbers (cast to string); reject other types (bool, null, array, object).
	$attributes = array();
	foreach ( $attribute_merge_callbacks as $attribute_name => $merge_callback ) {
		$new_attribute   = $new_attributes[ $attribute_name ] ?? '';
		$extra_attribute = $extra_attributes[ $attribute_name ] ?? '';
		$new_attribute   = is_scalar( $new_attribute ) && ! is_bool( $new_attribute ) ? (string) $new_attribute : '';
		$extra_attribute = is_scalar( $extra_attribute ) && ! is_bool( $extra_attribute ) ? (string) $extra_attribute : '';

		if ( '' === $new_attribute && '' === $extra_attribute ) {
			continue;
		}

		$attributes[ $attribute_name ] = $merge_callback( $new_attribute, $extra_attribute );
	}

	foreach ( $extra_attributes as $attribute_name => $value ) {
		if ( ! isset( $attribute_merge_callbacks[ $attribute_name ] ) && is_scalar( $value ) && ! is_bool( $value ) ) {
			$attributes[ $attribute_name ] = (string) $value;
		}
	}

	if ( empty( $attributes ) ) {
		return '';
	}

	$normalized_attributes = array();
	foreach ( $attributes as $key => $value ) {
		$normalized_attributes[] = $key . '="' . esc_attr( $value ) . '"';
	}

	return implode( ' ', $normalized_attributes );
}