<div class="radius"></div>
.radius{
  width:100px;
  height:100px;
  background:#333;
  border-radius: 50% 50% 50% 70%/50% 50% 70% 60%;
  -webkit-border-radius: 50% 50% 50% 70%/50% 50% 70% 60%;
  -moz-border-radius: 50% 50% 50% 70%/50% 50% 70% 60%;
}

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External JavaScript

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