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<!DOCTYPE html>
<html>
<head>
<style>
  #frameDiv {
    width: 200px;
    height: 200px;
    margin: 20px;
    position: relative;
    border: solid black 1px;
    background-color: rgb(205, 242, 205);
  }
  span {
    position: absolute;
    top: 0;
    left: 0;
  }
  #frameDiv > div {
    width: 50px;
    height: 20px;
    border-radius: 3px 10px 10px 3px;
    background-color: hotpink;
    offset-path: path('M20,170 L100,20 L180,100 Z');
    animation: moveDiv 3s 3;
  }
  @keyframes moveDiv {
    100%  { offset-distance: 100%; }
  }
</style>
</head>
<body>
<h1>Animation along an offset-path</h1>
<div id="frameDiv">
  <span>200x200px</span>
  <div></div>
</div>