WP_Theme_JSON::get_blocks_metadata(): array

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			continue;
		}

		$result = static::remove_keys_not_in_schema( $input[ $subtree ], $schema[ $subtree ] );

		if ( empty( $result ) ) {
			unset( $output[ $subtree ] );
		} else {
			$output[ $subtree ] = static::resolve_custom_css_format( $result );
		}
	}

	return $output;
}

/**
 * Appends a sub-selector to an existing one.
 *
 * Given the compounded $selector "h1, h2, h3"
 * and the $to_append selector ".some-class" the result will be
 * "h1.some-class, h2.some-class, h3.some-class".
 *
 * @since 5.8.0
 * @since 6.1.0 Added append position.
 * @since 6.3.0 Removed append position parameter.
 *
 * @param string $selector  Original selector.
 * @param string $to_append Selector to append.
 * @return string The new selector.
 */
protected static function append_to_selector( $selector, $to_append ) {
	if ( ! str_contains( $selector, ',' ) ) {
		return $selector . $to_append;
	}
	$new_selectors = array();
	$selectors     = explode( ',', $selector );
	foreach ( $selectors as $sel ) {
		$new_selectors[] = $sel . $to_append;
	}
	return implode( ',', $new_selectors );
}

/**
 * Prepends a sub-selector to an existing one.
 *
 * Given the compounded $selector "h1, h2, h3"
 * and the $to_prepend selector ".some-class " the result will be
 * ".some-class h1, .some-class  h2, .some-class  h3".
 *
 * @since 6.3.0
 *

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