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chromium/third_party/blink/web_tests/external/wpt/css/filter-effects/reference/backdrop-filter-edge-pixels-2-ref.html 

<!DOCTYPE html>
<link rel="author" href="mailto:[email protected]">
<link rel="author" href="mailto:[email protected]">
<link rel="help" href="https://drafts.fxtf.org/filter-effects-2/#BackdropFilterProperty">
<script src="../support/simulate-backdrop-blur.js"></script>
<div class="red_square"></div>
<div class="filter"></div>

<style>
div {
  width: 100px;
  position: absolute;
}
body { overflow: hidden; margin: 0;}
.red_square {
  height: 100px;
  left:30px;
  top: 20px;
  background: red;
  transform: rotate(30deg);
}
.filter {
  height: 200px;
  background: transparent;
}
</style>
<script>
simulateBackdropBlur(document.querySelector('.filter'), [document.querySelector('.red_square')], 20);
</script>