1 const panels = document.querySelectorAll('.panel');
2 function toggleOpen(){
3   
this.classList.toggle('open')
4 }
5 function toggleActive(e){
6   
// console.log(e.propertyName);
7   
if(e.propertyName.includes('flex')){
8     
this.classList.toggle('open-active');
9   }
10 }
11 panels.forEach(panel => {
12   panel.addEventListener(
'click',toggleOpen)
13 });
14 panels.forEach(panel => {
15   panel.addEventListener(
'transitionend',toggleActive)
16 });


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