Function reportError

lib/html/syntax.js:421–425

(code, start, end, severity)

	 * @param {ParseErrorSeverity} severity error severity
	 */
	const reportError = (code, start, end, severity) => {
		if (callbacks.parseError !== undefined) {
			callbacks.parseError(input, code, start, end, severity);
		}
	};

	/**
	 * Emits the WHATWG numeric-character-reference validation parse error for