Set focus and tab focus class
function setFocus() {
	  var element = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : null;
	  var tabFocus = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;

	  if (!is$1.element(element)) {
	    return;
	  } // Set regular focus


	  element.focus({
	    preventScroll: true
	  }); // If we want to mimic keyboard focus via tab

	  if (tabFocus) {
	    toggleClass(element, this.config.classNames.tabFocus);
	  }
	}