[Aetae]

Nick1, я так понял ты вообще не знаешь js?

var comment = (function createCurrentURLComment(window){
  function punycodeDecodeURI(href) {
    const at = href.indexOf('@') + 1 || href.indexOf('://') + 3 || href.indexOf(':') + 1;
    const sl = href.indexOf('/', at) + 1 || href.length;
    return href.slice(0, at)
      + href.slice(at, sl).replace(
        /(^|\.)xn--(?:([a-z0-9-]+)-)?([a-z0-9]+)/g,
        function(text, separator, ascii, utf) {
          const output = Array.from(ascii || '', c => c.charCodeAt(0));
          const input  = Array.from(utf, c => c.charCodeAt(0) - (c < ':' ? 0x16 : 0x61));
          const inputLength = input.length;

          for (let x = 0, i = 0, j = 0, n = 128, b = 72, o = output.length + 1; x < inputLength; j = i) {
            for (let w = 1, k = 36, d, t;; k += 36) {
              if (x === inputLength) return text; //invalid-input
              d = input[x++];
              if (d > ((2147483647 - i) / w | 0)) return text; //overflow
              i += d * w;
              t = k <= b ? 1 : k >= b + 26 ? 26 : k - b;
              if (d < t) break;
              if (w > (2147483647 / (t = 36 - t) | 0)) return text; //overflow
              w *= t;
            }
            b = j === 0 ? i / 700 | 0 : i - j >> 1;
            b += b / o | 0;
            for(j = 0; b > 455; j += 36) b = b / 35 | 0;
            b = j + 36 * b / (b + 38) | 0;
            if ((j = i / o | 0) > 2147483647 - n) return text; //overflow
            n += j;
            i %= o++;
            output.splice(i++, 0, n);
          }

          return separator + String.fromCodePoint(...output);
        }
      )
    + href.slice(sl)
  }

  function getSavedFrom(){
    return ' saved from url=' + decodeURI(punycodeDecodeURI(location.href)) + ' ';
  }
  
  var document = window.document,
      location = window.location,
      comment = document.createComment(getSavedFrom());
    
  document.documentElement.before(comment);
 
  window.addEventListener('popstate', function(){
    comment.data = getSavedFrom();
  }, false);
    
  return comment
}(window));