thx for your response,
and I'm very confused "because your 'disappear' tween ends with an opacity of 0", because I already set the dom opacity is 1 before `from` method, right? like
.set('#quote', {opacity: 1})
so I think `show` button will be set opacity of 1 every time before it does tween
and I also try to change to `fromTo` method, but it's not work, I don't know why,
the demo is https://codepen.io/dxcqcv/pen/yLRKQJV