Reformat a page with javascript using a bookmark.

reformat.js

javascript:(function() {  
  var webFont = document.createElement('script');
  webFont.src = ('https:' == document.location.protocol ? 'https' : 'http') 
   +'://ajax.googleapis.com/ajax/libs/webfont/1/webfont.js';
  webFont.type = 'text/javascript';
  webFont.async = true;
  document.querySelector('body').appendChild(webFont);

  WebFontConfig = {
    google: { 
      families: [ 'Open+Sans:300:latin,latin-ext' ] 
    }
  };

  var elem = document.querySelectorAll( prompt('Enter an element') );
  var i = 0;
  while(i < elem.length) {
    elem[i].style.fontWeight = 300; 
    elem[i].style.fontFamily = 'Open Sans'; 
    elem[i].style.fontSize = '18px';
    i++;
  }
  return true;
}).call();