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

<!DOCTYPE html>
<title>SVG Filters: &lt;filter> with filter region using calc() for 'width'</title>
<link rel="help" href="https://drafts.fxtf.org/filter-effects/#FilterProperty">
<link rel="help" href="https://drafts.fxtf.org/filter-effects/#ColorInterpolationFiltersProperty">
<link rel="help" href="https://drafts.fxtf.org/filter-effects/#FilterElement">
<link rel="help" href="https://drafts.fxtf.org/filter-effects/#feFloodElement">
<link rel="help" href="https://drafts.fxtf.org/filter-effects/#element-attrdef-filter-width">
<link rel="match" href="reference/green-100x100.html">
<style>
#target {
  width: 200px;
  height: 100px;
  background-color: red;
  filter: url(#f);
}
</style>
<div id="target"></div>
<svg width="0" height="0">
  <filter id="f" x="0" y="0" width="calc(25% + 0.25px)" height="1"
          color-interpolation-filters="sRGB">
    <feFlood flood-color="green"/>
  </filter>
</svg>