Function isNoncharacter

lib/html/syntax.js:246–247

(code)

 * @returns {boolean} is a Unicode noncharacter
 */
const isNoncharacter = (code) =>
	(code >= 0xfdd0 && code <= 0xfdef) || (code & 0xfffe) === 0xfffe;

/**
 * @param {number} code numeric character reference code point