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chromium/third_party/blink/web_tests/svg/filters/feSpotLight-primitiveUnits-objectBoundingBox.html 

<!DOCTYPE html>
<svg width="200" height="200">
  <filter id="puobb" primitiveUnits="objectBoundingBox" x="0" y="0" width="1" height="1">
    <feDiffuseLighting>
      <feSpotLight x="0.5" y="0.5" z="0.4" pointsAtX="0.5" pointsAtY="0.5" pointsAtZ="0.2"/>
    </feDiffuseLighting>
  </filter>
  <rect x="50" y="50" width="100" height="100" filter="url(#puobb)"/>
</svg>