chromium/third_party/blink/web_tests/css3/filters/backdrop-filter-browser-zoom.html

<!DOCTYPE html>
<meta charset="utf-8">
<title>backdrop-filter: Clipping should work when browser zoom is not 100%</title>
<div class="box"></div>
<div class="navbar">
  <div class="menu"></div>
  <div class="menu2"></div>
</div>

<!-- TODO(978481): Convert this back to WPT test. See crbug.com/978481 for
  an implementation in WPT that is waiting for the WPT Fuzzy Matching feature.
-->
<style>
div {
  position: absolute;
}
.box {
  width: 200px;
  height: 200px;
  top: 100px;
  left: 100px;
  background: green;
}
.navbar {
  width: 300px;
  height: 50px;
  top: 150px;
  left: 50px;
  border: 2px solid blue;
  backdrop-filter: invert(1);
  border-radius: 10px 20px 30px 40px;
}
.menu {
  width: 100px;
  height: 150px;
  top: 50px;
  left: 95px;
  border: 2px solid red;
}
.menu2 {
  width: 100px;
  height: 30px;
  top: -34px;
  left: 95px;
  border: 2px solid red;
}
</style>
<script>
  if (window.testRunner)
    testRunner.setPageZoomFactor(1.5);
</script>
</html>