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* HTML API: WP_HTML_Unsupported_Exception class
* Core class used by the HTML processor during HTML parsing
* for indicating that a given operation is unsupported.
* This class is designed for internal use by the HTML processor.
* The HTML API aims to operate in compliance with the HTML5
* specification, but does not implement the full specification.
* In cases where it lacks support it should not cause breakage
* or unexpected behavior. In the cases where it recognizes that
* it cannot proceed, this class is used to abort from any
* operation and signify that the given HTML cannot be processed.
class WP_HTML_Unsupported_Exception extends Exception {