Function byteLength

scripts/test.js:265–275

(str)

      // https://stackoverflow.com/a/23329386
      function byteLength(str) {
        // returns the byte length of an utf8 string
        var s = str.length;
        for (var i = str.length - 1; i >= 0; i--) {
          var code = str.charCodeAt(i);
          if (code > 0x7f && code <= 0x7ff) s++;
          else if (code > 0x7ff && code <= 0xffff) s += 2;
          if (code >= 0xdc00 && code <= 0xdfff) i--; //trail surrogate
        }
        return s;
      }

      try {
        let text = document.body.innerText;