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chromium/third_party/blink/web_tests/external/wpt/css/filter-effects/backdrop-filter-svg-blur.html 

<!DOCTYPE html>
<meta charset="utf-8">
<meta name=fuzzy content="maxDifference=0-20;totalPixels=0-10000">
<title>backdrop-filter: Correctly apply backdrop-filter with an SVG filter</title>
<link rel="help" href="https://drafts.fxtf.org/filter-effects-2/#BackdropFilterProperty">
<link rel="match"  href="reference/backdrop-filter-svg-blur-ref.html">

<p>The green box should filter the blue box.</p>

<svg width="200" height="200">
  <rect width="50" height="50" fill="blue"></rect>
  <rect x="20" y="20" width="50" height="50" fill="green" opacity="0.5" style="backdrop-filter: blur(10px);"></rect>
</svg>