ogus comments. Nonetheless,
	 * the Tag Processor recognizes them in a stream of HTML and
	 * exposes them for inspection and modification.
	 *
	 * @since 6.5.0
	 *
	 * @access private
	 */
	const STATE_FUNKY_COMMENT = 'STATE_WP_FUNKY';

	/**
	 * Indicates that a comment was created when encountering abruptly-closed HTML comment.
	 *
	 * Example:
	 *
	 *     <!-->
	 *     <!--->
	 *
	 * @since 6.5.0
	 */
	const COMMENT_AS_ABRUPTLY_CLOSED_COMMENT = 'COMMENT_AS_ABRUPTLY_CLOSED_COMMENT';

	/**
	 * Indicates that a comment would be parsed as a CDATA node,
	 * were HTML to allow CDATA nodes outside of foreign content.
	 *
	 * Example:
	 *
	 *     <![CDATA[This is a CDATA node.]]>
	 *
	 * This is an HTML comment, but it looks like a CDATA node.
	 *
	 * @since 6.5.0
	 */
	const COMMENT_AS_CDATA_LOOKALIKE = 'COMMENT_AS_CDATA_LOOKALIKE';

	/**
	 * Indicates that a comment was created when encountering
	 * normative HTML comment syntax.
	 *
	 * Example:
	 *
	 *     <!-- this is a comment -->
	 *
	 * @since 6.5.0
	 */
	const COMMENT_AS_HTML_COMMENT = 'COMMENT_AS_HTML_COMMENT';

	/**
	 * Indicates that a comment would be parsed as a Processing
	 * Instruction node, were they to exist within HTML.
	 *
	 * Example:
	 *
	 *     <?wp __( 'Like' ) ?>
	 *
	 * This is an HTML comment, but it looks like a CDATA node.
	 *
	 * @since 6.5.0
	 */
	const COMMENT_AS_PI_NODE_LOOKALIKE = 'COMMENT_AS_PI_NODE_LOOKALIKE';

	/**
	 * Indicates that a comment was created when encountering invalid
	 * HTML input, a so-called "bogus comment."
	 *
	 * Example:
	 *
	 *     <?nothing special>
	 *     <!{nothing special}>
	 *
	 * @since 6.5.0
	 */
	const COMMENT_AS_INVALID_HTML = 'COMMENT_AS_INVALID_HTML';

	/**
	 * No-quirks mode document compatability mode.
	 *
	 * > In no-quirks mode, the behavior is (hopefully) the desired behavior
	 * > described by the modern HTML and CSS specifications.
	 *
	 * @see self::$compat_mode
	 * @see https://developer.mozilla.org/en-US/docs/Web/HTML/Quirks_Mode_and_Standards_Mode
	 *
	 * @since 6.7.0
	 *
	 * @var string
	 */
	const NO_QUIRKS_MODE = 'no-quirks-mode';

	/**
	 * Quirks mode document compatability mode.
	 *
	 * > In quirks mode, layout emulates behavior in Navigator 4 and Internet
	 * > Explorer 5. This is essential in order to support websites that were
	 * > built before the widespread adoption of web standards.
	 *
	 * @see self::$compat_mode
	 * @see https://developer.mozilla.org/en-US/docs/Web/HTML/Quirks_Mode_and_Standards_Mode
	 *
	 * @since 6.7.0
	 *
	 * @var string
	 */
	const QUIRKS_MODE = 'quirks-mode';

	/**
	 * Indicates that a span of text may contain any combination of significant
	 * kinds of characters: NULL bytes, whitespace, and others.
	 *
	 * @see self::$text_node_classification
	 * @see self::subdivide_text_appropriately
	 *
	 * @since 6.7.0
	 */
	const TEXT_IS_GENERIC = 'TEXT_IS_GENERIC';

	/**
	 * Indicates that a span of text comprises a sequence only of NULL bytes.
	 *
	 * @see self::$text_node_classification
	 * @see self::subdivide_text_appropriately
	 *
	 * @since 6.7.0
	 */
	const TEXT_IS_NULL_SEQUENCE = 'TEXT_IS_NULL_SEQUENCE';

	/**
	 * Indicates that a span of decoded text comprises only whitespace.
	 *
	 * @see self::$text_node_classification
	 * @see self::subdivide_text_appropriately
	 *
	 * @since 6.7.0
	 */
	const TEXT_IS_WHITESPACE = 'TEXT_IS_WHITESPACE';
}