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chromium/third_party/blink/web_tests/external/wpt/css/filter-effects/clip-under-filter-002.html 

<!DOCTYPE html>
<title>CSS Filters: Clips on descendants of filter elements are applied</title>
<link rel="author" title="Xianzhu Wang" href="[email protected]">
<link rel="help" href="https://drafts.fxtf.org/filter-effects-1/#funcdef-filter-blur">
<link rel="help" href="https://drafts.csswg.org/css-overflow-3/#overflow-properties">
<link rel="help" href="https://crbug.com/809102">
<link rel="match" href="reference/clip-under-filter-002-ref.html">
<meta name="assert" content="Check that there is a blurred square, left half blue and right half green"/>

<div style="filter: blur(10px)">
  <div style="position: relative; width: 100px; height: 100px; background: blue; overflow: hidden">
    <div style="position: absolute; width: 100px; height: 100px; right: -50px; background: green; overflow: hidden"></div>
  </div>
</div>