WP_HTML_Open_Elements::has_element_in_specific_scope( string $tag_name, string[] $termination_list ): bool

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 *
 * @param int $nth Retrieve the nth item on the stack, with 1 being
 *                 the top element, 2 being the second, etc...
 * @return WP_HTML_Token|null Name of the node on the stack at the given location,
 *                            or `null` if the location isn't on the stack.
 */
public function at( int $nth ): ?WP_HTML_Token {
	foreach ( $this->walk_down() as $item ) {
		if ( 0 === --$nth ) {
			return $item;
		}
	}

	return null;
}

/**
 * Reports if a node of a given name is in the stack of open elements.
 *
 * @since 6.7.0
 *
 * @param string $node_name Name of node for which to check.
 * @return bool Whether a node of the given name is in the stack of open elements.
 */
public function contains( string $node_name ): bool {

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