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chromium/third_party/blink/web_tests/external/wpt/css/filter-effects/backdrop-filter-edge-mirror.html 

<!DOCTYPE html>
<meta charset="utf-8">
<meta name=fuzzy content="maxDifference=0-10;totalPixels=0-10000">
<title>backdrop-filter: Sampled pixels beyond edge should mirror back into the content.</title>
<link rel="author" href="mailto:[email protected]">
<link rel="help" href="https://drafts.fxtf.org/filter-effects-2/#backdrop-filter-operation">
<link rel="match"  href="reference/backdrop-filter-edge-mirror-ref.html">

<div class="box border"></div>
<div class="box filter"></div>
<div style="position:absolute;top:100px;will-change:transform;">
  <p>Expected above: A pure white box with a very small hint of the 1px blue border blurred inside.</p>
</div>

<style>
.box {
  position: absolute;
  width: 100px;
  height: 100px;
  top: 8px;
  left: 8px;
  box-sizing: border-box;
}
.filter {
  backdrop-filter: blur(10px);
}
.border {
  border: 1px solid blue;
}
</style>