WP_Duotone::enqueue_block_css( string $filter_id, string $duotone_selector, string $filter_value )

Source

private static function enqueue_block_css( $filter_id, $duotone_selector, $filter_value ) {
	// Build the CSS selectors to which the filter will be applied.
	$selectors = explode( ',', $duotone_selector );

	$selectors_scoped = array();
	foreach ( $selectors as $selector_part ) {
		/*
		 * Assuming the selector part is a subclass selector (not a tag name)
		 * so we can prepend the filter id class. If we want to support elements
		 * such as `img` or namespaces, we'll need to add a case for that here.
		 */
		$selectors_scoped[] = '.' . $filter_id . trim( $selector_part );
	}

	$selector = implode( ', ', $selectors_scoped );

	self::$block_css_declarations[] = array(
		'selector'     => $selector,
		'declarations' => array(
			'filter' => $filter_value,
		),
	);
}

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