css/css-cascade/revert-layer-011.html

<!DOCTYPE html>
<title>CSS Cascade Layers: 'revert-layer' from animation origin to author origin on custom property</title>
<link rel="help" href="https://drafts.csswg.org/css-cascade-5/#revert-layer">
<link rel="author" href="mailto:xiaochengh@chromium.org">
<link rel="match" href="reference/ref-filled-green-100px-square.xht">

<style>
#target {
  width: var(--x);
  --x: 150px;
  height: 100px;
  background-color: green;
  animation: anim linear 2s -1s paused;
}

@property --x {
  syntax: '<length>';
  initial-value: 0px;
  inherits: false;
}

@keyframes anim {
  from { --x: 50px; }
  to { --x: revert-layer; }
}
</style>

<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div id="target"></div>