A modernizr test to see if browser adds scrollbar on "overflow: scroll" elements

modernizr.overflowscroll.js

/**
 * Test detecting if scrollbars are available
 * on overflow-scroll elements.
*/
Modernizr.addTest('overflowscroll',function(){

  var container = document.createElement('div');
  container.style.cssText= 'height: 200px; width: 400px; overflow:scroll';

  var content = document.createElement('div');
  content.style.cssText= 'height: 400px;';
  container.appendChild(content);

  var fake = false,
  root = document.body || (function () {
    fake = true;
    return document.documentElement.appendChild(document.createElement('body'));
  }());

  var oldCssText = root.style.cssText;
  root.style.cssText = 'padding:0;margin:0';
  root.appendChild(container);

  var result =  container.clientWidth != container.offsetWidth;

  root.removeChild(container);
  root.style.cssText = oldCssText;

  if (fake) {
    document.documentElement.removeChild(root);
  }

  return result;
});