説明

transitionend event：漸變結束後→觸發事件

#box(ontransitionend="transShow()") hover me
p#transStatus

#box
 border: 1px solid #000
 display: inline-block
 transition-duration: 0.5s
 &:hover
  font-size: 30px

function transShow(){
 transStatus.textContent="Transition is Done"
}

Display