$opener_tag ]->start + $this->bookmarks[ $opener_tag ]->length + 1;
		$before_closer_tag = $this->bookmarks[ $closer_tag ]->start;

		if ( $rewind ) {
			$this->seek( $opener_tag );
		}

		$this->release_bookmark( $opener_tag );
		$this->release_bookmark( $closer_tag );

		return array( $after_opener_tag, $before_closer_tag );
	}

	/**
	 * Returns a pair of bookmarks for the current opener tag and the matching
	 * closer tag.
	 *
	 * It positions the cursor in the closer tag of the balanced tag, if it
	 * exists.
	 *
	 * @since 6.5.0
	 *
	 * @return array|null A pair of bookmarks, or null if there's no matching closing tag.
	 */
	private function get_balanced_tag_bookmarks() {
		static $i   = 0;
		$opener_tag = 'opener_tag_of_balanced_tag_' . ++$i;

		$this->set_bookmark( $opener_tag );
		if ( ! $this->next_balanced_tag_closer_tag() ) {
			$this->release_bookmark( $opener_tag );
			return null;
		}

		$closer_tag = 'closer_tag_of_balanced_tag_' . ++$i;
		$this->set_bookmark( $closer_tag );

		return array( $opener_tag, $closer_tag );
	}

	/**
	 * Skips processing the content between tags.
	 *
	 * It positions the cursor in the closer tag of the foreign element, if it
	 * exists.
	 *
	 * This function is intended to skip processing SVG and MathML inner content
	 * instead of bailing out the whole processing.
	 *
	 * @since 6.5.0
	 *
	 * @access private
	 *
	 * @return bool Whether the foreign content was successfully skipped.
	 */
	public function skip_to_tag_closer(): bool {
		$depth    = 1;
		$tag_name = $this->get_tag();
		while ( $depth > 0 && $this->next_tag(
			array(
				'tag_name'    => $tag_name,
				'tag_closers' => 'visit',
			)
		) ) {
			if ( $this->has_self_closing_flag() ) {
				continue;
			}
			$depth += $this->is_tag_closer() ? -1 : 1;
		}

		return 0 === $depth;
	}

	/**
	 * Finds the matching closing tag for an opening tag.
	 *
	 * When called while the processor is on an open tag, it traverses the HTML
	 * until it finds the matching closer tag, respecting any in-between content,
	 * including nested tags of the same name. Returns false when called on a
	 * closer tag, a tag that doesn't have a closer tag (void), a tag that
	 * doesn't visit the closer tag, or if no matching closing tag was found.
	 *
	 * @since 6.5.0
	 *
	 * @access private
	 *
	 * @return bool Whether a matching closing tag was found.
	 */
	public function next_balanced_tag_closer_tag(): bool {
		$depth    = 0;
		$tag_name = $this->get_tag();

		if ( ! $this->has_and_visits_its_closer_tag() ) {
			return false;
		}

		while ( $this->next_tag(
			array(
				'tag_name'    => $tag_name,
				'tag_closers' => 'visit',
			)
		) ) {
			if ( ! $this->is_tag_closer() ) {
				++$depth;
				continue;
			}

			if ( 0 === $depth ) {
				return true;
			}

			--$depth;
		}

		return false;
	}

	/**
	 * Checks whether the current tag has and will visit its matching closer tag.
	 *
	 * @since 6.5.0
	 *
	 * @access private
	 *
	 * @return bool Whether the current tag has a closer tag.
	 */
	public function has_and_visits_its_closer_tag(): bool {
		$tag_name = $this->get_tag();

		return null !== $tag_name && (
			! WP_HTML_Processor::is_void( $tag_name ) &&
			! in_array( $tag_name, self::TAGS_THAT_DONT_VISIT_CLOSER_TAG, true )
		);
	}
}