File: cancel-animation-with-selector-matching.html

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<!DOCTYPE html>
<html class="reftest-wait">
<title>Discard cancelled animation styles</title>
<style>
#test {
  width: 100px; height: 100px;
  background-color: white;
}
.changed {
  color: red;
}

</style>
<div id="test"></div>
<script>
  var target = document.getElementById("test");
  var anim = target.animate({ backgroundColor: [ "red", "red" ] }, 100000);

  anim.ready.then(() => {
    anim.cancel();
    // Add a class name to cause selector matching in a subsequent restyle.
    target.classList.add("changed");

    document.documentElement.classList.remove("reftest-wait");
  });
</script>