css/css-position/animations/position-interpolation.html

<!DOCTYPE html>
<meta charset="UTF-8">
<title>position interpolation</title>
<link rel="help" href="https://drafts.csswg.org/css-position-3/#position-property">
<meta name="assert" content="position has discrete animation">

<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/interpolation-testcommon.js"></script>

<style>
.parent {
  position: relative;
  display: inline-block;
  height: 10px;
  margin: 0px;
}
.target {
  width: 10px;
  height: 10px;
  background-color: black;
  left: 10px;
  position: 10px;
}
.expected {
  background-color: green;
}
</style>

<body>
<template id="target-template">
  <div class="parent">
    <div class="target"></div>
  </div>
</template>
</body>

<script>
test_no_interpolation({
  property: 'position',
  from: 'absolute',
  to: 'static',
});

// This is still discrete interpolation; this test ensures that the neutral
// keyframe is defined correctly for position.
test_interpolation({
  property: 'position',
  from: neutralKeyframe,
  to: 'absolute',
  method: 'CSS Animations',
}, [
  {at: -1, expect: 'static'},
  {at: 0, expect: 'static'},
  {at: 0.25, expect: 'static'},
  {at: 0.5, expect: 'absolute'},
  {at: 0.75, expect: 'absolute'},
  {at: 1, expect: 'absolute'},
  {at: 2, expect: 'absolute'},
]);
</script>