testing/web-platform/tests/css/css-pseudo/backdrop-animate-002-ref.html


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<!DOCTYPE html>
<meta charset="utf-8">
<dialog id="target">Dialog contents</dialog>
<style>
#target::backdrop {
  opacity: 0.1;
  background-color: green;
}
</style>
<script>
const target = document.getElementById("target");
target.showModal();
</script>