File: child-in-animating-element-display-none.html

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<!DOCTYPE html>
<html class="reftest-wait">
<title>
Child element in animating element that display property is changed from none
</title>
<style>
#test {
  display: none;
  width: 100px;
  height: 100px;
}
#child {
  background-color: green;
  width: 50px;
  height: 50px;
}
</style>
<div id="test">
  <div id="child"></div>
</div>
<script>
  var anim = test.animate({ backgroundColor: [ 'blue', 'blue' ] },
                          { duration: 1000,
                            iterations: Infinity });

  requestAnimationFrame(() => {
    requestAnimationFrame(() => {
      document.styleSheets[0].cssRules[0].style.setProperty('display', 'block');
      document.documentElement.classList.remove('reftest-wait');
    });
  });
</script>
</html>