backdrop-filter-plus-will-change-opacity-ref.html

<!DOCTYPE html>
<meta charset="utf-8">
<p>Expected: A black box.</p>
<div id="blackbox"></div>
<style>
  #blackbox {
    width: 100px;
    height: 100px;
    background-color: black;
  }
</style>

chromium/third_party/blink/web_tests/external/wpt/css/filter-effects/reference/backdrop-filter-plus-will-change-opacity-ref.html