Hover transition on clip path change

Question

With this code ,the hover effect is working ,the bottom right corner disappears but there is no transition,it's something wrong?

.mydiv:hover{
      background-color: blue;
      clip-path: polygon(0% 0%, 100% 0%, 80% 100%, 0% 100%);
      transition: 0.5s ease;
 }

Answer 1

You need to add an initial clip-path definition to have a transition between two states:

.box {
  background-color: blue;
  clip-path: polygon(0% 0%, 100% 0%, 100% 100%, 0% 100%);
  transition: 0.5s ease;
  height:150px;
}

.box:hover {
  clip-path: polygon(0% 0%, 100% 0%, 80% 100%, 0% 100%);
}

<div class="box">

</div>

You can also do the same with background and you will have better support:

.box {
  background: 
    linear-gradient(blue,blue) left,
    linear-gradient(to bottom right,blue 49.5%,transparent 50%) right;
  background-size:100% 100%,0% 100%;
  background-repeat:no-repeat;
  transition: 0.5s ease;
  height:150px;
}

.box:hover {
  background-size:80.1% 100%,20% 100%;
}

<div class="box">

</div>