code: function safeBlur(el) {
      if (el && el.blur && el != document.body) {
        el.blur();
      }
    }
docs: Blur the specified element, as long as it's not the HTML body element.
  This works around an IE9/10 bug - blurring the body causes Windows to
  blur the whole application.
  
  @param {Element} el to blur