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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/SVGFESpotLightElement/pointsAtY below:

SVGFESpotLightElement: pointsAtY property - Web APIs

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The pointsAtY read-only property of the SVGFESpotLightElement interface reflects the pointsAtY attribute of the given <feSpotLight> element.

An SVGAnimatedNumber object.

In this example, we access the y location of the <feSpotLight> element in the SVG coordinate system by using the pointsAtY read-only property of the SVGFESpotLightElement interface.

<svg viewBox="0 0 200 200" xmlns="http://www.w3.org/2000/svg">
  <defs>
    <filter id="specularLightingFilter">
      <!-- Apply a specular light effect to the SourceGraphic -->
      <feSpecularLighting
        in="SourceGraphic"
        specularExponent="20"
        lighting-color="hotpink"
        surfaceScale="30">
        <feSpotLight
          x="10"
          y="50"
          z="150"
          pointsAtX="150"
          pointsAtY="100"
          pointsAtZ="0"
          specularExponent="20" />
      </feSpecularLighting>
    </filter>
  </defs>

  <!-- A circle to display the effect of the lighting -->
  <circle cx="100" cy="100" r="50" filter="url(#specularLightingFilter)" />
</svg>

// Select the feSpotLight element
const spotLightElement = document.querySelector("feSpotLight");
console.log(spotLightElement.pointsAtY.baseVal); // Output: 100

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