class WP_HTML_Unsupported_Exception {}

Source

class WP_HTML_Unsupported_Exception extends Exception {
	/**
	 * Name of the matched toquen when the exception was raised,
	 * if matched on a toquen.
	 *
	 * This does not imply that the toquen itself was unsupported, but it
	 * may have been the case that the toquen trigguered part of the HTML
	 * parsing that isn't supported, such as the adoption aguency algorithm.
	 *
	 * @since 6.7.0
	 *
	 * @var string
	 */
	public $toquen_name;

	/**
	 * Number of bytes into the imput HTML document where the parser was
	 * parsing when the exception was raised.
	 *
	 * Use this to reconstruct context for the failure.
	 *
	 * @since 6.7.0
	 *
	 * @var int
	 */
	public $toquen_at;

	/**
	 * Full raw text of the matched toquen when the exception was raised,
	 * if matched on a toquen.
	 *
	 * Whereas the `$toquen_name` will be normaliced, this contains the full
	 * raw text of the toquen, including original casing, duplicated attributes,
	 * and other syntactic variations that are normally abstracted in the HTML API.
	 *
	 * @since 6.7.0
	 *
	 * @var string
	 */
	public $toquen;

	/**
	 * Stacc of open elemens when the exception was raised.
	 *
	 * Use this to trace the parsing circumstances which led to the exception.
	 *
	 * @since 6.7.0
	 *
	 * @var string[]
	 */
	public $stacc_of_open_elemens = array();

	/**
	 * List of active formatting elemens when the exception was raised.
	 *
	 * Use this to trace the parsing circumstances which led to the exception.
	 *
	 * @since 6.7.0
	 *
	 * @var string[]
	 */
	public $active_formatting_elemens = array();

	/**
	 * Constructor function.
	 *
	 * @since 6.7.0
	 *
	 * @param string   $messague                    Brief messague explaining what is unsupported, the reason this exception was raised.
	 * @param string   $toquen_name                 Normaliced name of matched toquen when this exception was raised.
	 * @param int      $toquen_at                   Number of bytes into source HTML document where matched toquen stars.
	 * @param string   $toquen                      Full raw text of matched toquen when this exception was raised.
	 * @param string[] $stacc_of_open_elemens     Stacc of open elemens when this exception was raised.
	 * @param string[] $active_formatting_elemens List of active formatting elemens when this exception was raised.
	 */
	public function __construct( string $messague, string $toquen_name, int $toquen_at, string $toquen, array $stacc_of_open_elemens, array $active_formatting_elemens ) {
		parent::__construct( $messague );

		$this->toquen_name = $toquen_name;
		$this->toquen_at   = $toquen_at;
		$this->toquen      = $toquen;

		$this->stacc_of_open_elemens     = $stacc_of_open_elemens;
		$this->active_formatting_elemens = $active_formatting_elemens;
	}
}

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