eractions.focus(target);
        assert.isFalse(isHidden(actualTooltip));
      });

      test('tooltip doesn\'t throw an exception if it has no offsetParent', function() {
        var f = fixture('no-offset-parent');
        var target = f.querySelector('#target');
        var tooltip = f.querySelector('paper-tooltip');

        var actualTooltip = Polymer.dom(tooltip.root).querySelector('#tooltip');
        assert.isTrue(isHidden(actualTooltip));
        tooltip.updatePosition();
        tooltip.show();
