code: function isBackwards(sel) {
  	sel = sel || getSelection();
  	if (isCollapsed(sel)) { return; }
  
  	// Detect if selection is backwards
  	var range = doc.createRange();
  	range.setStart(sel.anchorNode, sel.anchorOffset);
  	range.setEnd(sel.focusNode, sel.focusOffset);
  	range.detach();
  
  	// if `collapsed` then it's backwards
  	return range.collapsed;
  }
docs: Detect the direction of the Selection
  @param  {Selection} sel
  @return {Boolean}