WP_HTML_Doctype_Info

59class WP_HTML_Doctype_Info {60	/**61	 * Name of the DOCTYPE: should be "html" for HTML documents.62	 *63	 * This value should be considered "read only" and not modified.64	 *65	 * Historically the DOCTYPE name indicates name of the document's root element.66	 *67	 *     <!DOCTYPE html>68	 *               ╰──┴── name is "html".69	 *70	 * @see https://html.spec.whatwg.org/#tokenization71	 *72	 * @since 6.7.073	 *74	 * @var string|null75	 */76	public $name = null;77 78	/**79	 * Public identifier of the DOCTYPE.80	 *81	 * This value should be considered "read only" and not modified.82	 *83	 * The public identifier is optional and should not appear in HTML documents.84	 * A `null` value indicates that no public identifier was present in the DOCTYPE.85	 *86	 * Historically the presence of the public identifier indicated that a document87	 * was meant to be shared between computer systems and the value indicated to a88	 * knowledgeable parser how to find the relevant document type definition (DTD).89	 *90	 *     <!DOCTYPE html PUBLIC "public id goes here in quotes">91	 *               │  │         ╰─── public identifier ─────╯92	 *               ╰──┴── name is "html".93	 *94	 * @see https://html.spec.whatwg.org/#tokenization95	 *96	 * @since 6.7.097	 *98	 * @var string|null99	 */100	public $public_identifier = null;101 102	/**103	 * System identifier of the DOCTYPE.104	 *105	 * This value should be considered "read only" and not modified.106	 *107	 * The system identifier is optional and should not appear in HTML documents.108	 * A `null` value indicates that no system identifier was present in the DOCTYPE.109	 *110	 * Historically the system identifier specified where a relevant document type111	 * declaration for the given document is stored and may be retrieved.112	 *113	 *     <!DOCTYPE html SYSTEM "system id goes here in quotes">114	 *               │  │         ╰──── system identifier ────╯115	 *               ╰──┴── name is "html".116	 *117	 * If a public identifier were provided it would indicate to a knowledgeable118	 * parser how to interpret the system identifier.119	 *120	 *     <!DOCTYPE html PUBLIC "public id goes here in quotes" "system id goes here in quotes">121	 *               │  │         ╰─── public identifier ─────╯   ╰──── system identifier ────╯122	 *               ╰──┴── name is "html".123	 *124	 * @see https://html.spec.whatwg.org/#tokenization125	 *126	 * @since 6.7.0127	 *128	 * @var string|null129	 */130	public $system_identifier = null;131 132	/**133	 * Which document compatibility mode this DOCTYPE declaration indicates.134	 *135	 * This value should be considered "read only" and not modified.136	 *137	 * When an HTML parser has not already set the document compatibility mode,138	 * (e.g. "quirks" or "no-quirks" mode), it will be inferred from the properties