motion-path-js/examples/offsetAnchorPosition.html at main · Motion-Path-Polyfill/motion-path-js · GitHub

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<!DOCTYPE html>
<script src="../third_party/web-animations-js/web-animations.dev.js"></script>
<script src="../motion-path-polyfill.min.js"></script>

<div id="container">
  <div id="targetA">
  </div>
  <div id="targetB">
  </div>
  <div id="targetC">
  </div>
  <div id="targetD">
  </div>
</div>

<style>
  body {
    margin: 0px;
    background-color: black;
  }

  #container {

    position: absolute;
    left: 300px;
    top: 300px;
    background-color: white;

    width: 500px;
    height: 500px;
    transform: scale(1);
  }

  #targetA {
    width: 100px;
    height: 100px;
    background-color: lime;
    position: absolute;
    left: 300px;
    top: 300px;
  }

  #targetB {
    width: 160px;
    height: 100px;
    background-color: yellow;
    position: absolute;
    left: 300px;
    top: 300px;
  }

  #targetC {
    width: 160px;
    height: 160px;
    background-color: blue;
    position: absolute;
    left: 300px;
    top: 300px;
  }

  #targetD {
    width: 100px;
    height: 160px;
    background-color: red;
    position: absolute;
    left: 300px;
    top: 300px;
  }

</style>

<script>
  var keyframes = [
                   {offsetPosition: '0% 0%', offsetAnchor: 'auto'},
                   {offsetPosition: '100% 0%', offsetAnchor: 'auto'},
                   {offsetPosition: '100% 100%', offsetAnchor: 'auto'},
                   {offsetPosition: '0% 100%', offsetAnchor: 'auto'},
                   {offsetPosition: '0% 0%', offsetAnchor: 'auto'}
                  ];
  var timingA = {duration: 4000, iterations: Infinity, iterationStart: 0};
  var timingB = {duration: 4000, iterations: Infinity, iterationStart: 0.25};
  var timingC = {duration: 4000, iterations: Infinity, iterationStart: 0.50};
  var timingD = {duration: 4000, iterations: Infinity, iterationStart: 0.75};
  targetA.animate(keyframes, timingA);
  targetB.animate(keyframes, timingB);
  targetC.animate(keyframes, timingC);
  targetD.animate(keyframes, timingD);
</script>