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chromium/third_party/blink/web_tests/external/wpt/css/filter-effects/filter-scale-001.html 

<!doctype html>
<title>CSS Filter Effects test: Scaling is properly accounted for.</title>
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:[email protected]">
<link rel="author" title="Mozilla" href="https://mozilla.org">
<link rel="help" href="https://drafts.fxtf.org/filter-effects/#FilterProperty">
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1497239">
<link rel="match" href="filter-scale-001-ref.html">
<style>
  #outer {
    width: 15px;
    height: 15px;
    transform: scale(10);
    transform-origin: 0 0;
  }
  #inner {
    filter: url(#blur);
    width: 15px;
    height: 15px;
    background: green;
  }
</style>
<div id="outer">
  <div id="inner"></div>
</div>
<svg xmlns="http://www.w3.org/2000/svg">
  <defs>
    <filter id="blur">
      <feGaussianBlur in="SourceGraphic" stdDeviation="0,0"></feGaussianBlur>
    </filter>
  </defs>
</svg>