code: function getOffset(selector) {
        var rect, doc, docElem;
        var elem = document.querySelector(selector);
  
        if(!elem) { return false; }
        if(!elem.getClientRects().length) {
          return { top: 0, left: 0, width: 0, height: 0};
        }
  
        rect = elem.getBoundingClientRect();
  
        if(rect.width || rect.height) {
          doc = elem.ownerDocument;
          docElem = doc.documentElement;
        }
  
        return {
          top: rect.top + window.pageYOffset - docElem.clientTop,
          left: rect.left + window.pageXOffset - docElem.clientLeft,
          width: elem.offsetWidth,
          height: elem.offsetHeight
        }
      }
docs: Get offset information with native methods
  Because not everyone uses jQuery and QUnit does not depend on jQuery
  @param  {String} selector (.test, #test)
  @return {Object} position of the selector dom