tion did not change.
           */
          closeOnActivate: {
            type: Boolean,
            value: false
          },

          /**
           * An animation config. If provided, this will be used to animate the
           * opening of the dropdown.
           */
          openAnimationConfig: {
            type: Object,
            value: function() {
              return [{
                name: 'fade-in-animation',
                timing: {
                  delay: 100,
                  dura