<!DOCTYPE html>
<meta charset="UTF-8">
<style>
.parent {
  perspective-origin: 30px 10px;
}
.target {
  display: inline-block;
  -webkit-perspective: 50;
  perspective: 50;
  margin-top: 50px;
  margin-bottom: 25px;
  perspective-origin: 10px 30px;
}
.transformed {
  width: 50px;
  height: 50px;
  background: black;
  transform: rotateY(45deg);
}
.expected .transformed {
  background: green;
}
.expected {
  position: relative;
  left: -50px;
  opacity: 0.75;
}
</style>
<body>
<template id="target-template">
<div><div class="transformed"></div></div>
</template>
<script src="resources/interpolation-test.js"></script>
<script>
assertInterpolation({
  property: 'perspective-origin',
  from: neutralKeyframe,
  to: '20px 20px',
}, [
  {at: -0.3, is: '7px 33px'},
  {at: 0, is: '10px 30px'},
  {at: 0.3, is: '13px 27px'},
  {at: 0.6, is: '16px 24px'},
  {at: 1, is: '20px 20px'},
  {at: 1.5, is: '25px 15px'},
]);

assertInterpolation({
  property: 'perspective-origin',
  from: 'initial',
  to: '20px 20px',
}, [
  {at: -0.3, is: '26.5px 26.5px'},
  {at: 0, is: '25px 25px'},
  {at: 0.3, is: '23.5px 23.5px'},
  {at: 0.6, is: '22px 22px'},
  {at: 1, is: '20px 20px'},
  {at: 1.5, is: '17.5px 17.5px'},
]);

assertInterpolation({
  property: 'perspective-origin',
  from: 'inherit',
  to: '20px 20px',
}, [
  {at: -0.3, is: '33px 7px'},
  {at: 0, is: '30px 10px'},
  {at: 0.3, is: '27px 13px'},
  {at: 0.6, is: '24px 16px'},
  {at: 1, is: '20px 20px'},
  {at: 1.5, is: '15px 25px'},
]);

assertInterpolation({
  property: 'perspective-origin',
  from: 'unset',
  to: '20px 20px',
}, [
  {at: -0.3, is: '26.5px 26.5px'},
  {at: 0, is: '25px 25px'},
  {at: 0.3, is: '23.5px 23.5px'},
  {at: 0.6, is: '22px 22px'},
  {at: 1, is: '20px 20px'},
  {at: 1.5, is: '17.5px 17.5px'},
]);

assertInterpolation({
  property: 'perspective-origin',
  from: '0% 50%',
  to: '100% 150%'
}, [
  {at: -0.3, is: '-30% 20%'},
  {at: 0, is: '0% 50%'},
  {at: 0.3, is: '30% 80%'},
  {at: 0.6, is: '60% 110%'},
  {at: 1, is: '100% 150%'},
  {at: 1.5, is: '150% 200%'}
]);
</script>
</body>