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

SVGFESpotLightElement: specularExponent property - Web APIs

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

An SVGAnimatedNumber object.

In this example, we access the exponent value controlling the focus of the <feSpotLight> filter element's light source by using the specularExponent 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="40"
        lighting-color="hotpink"
        surfaceScale="5">
        <feSpotLight
          x="100"
          y="100"
          z="50"
          pointsAtX="100"
          pointsAtY="100"
          specularExponent="40" />
      </feSpecularLighting>
    </filter>
  </defs>
  <circle
    cx="100"
    cy="100"
    r="50"
    fill="lightblue"
    filter="url(#specularLightingFilter)" />
</svg>

// Select the feSpotLight element
const spotLightElement = document.querySelector("feSpotLight");

// Access the specularExponent property
console.log(spotLightElement.specularExponent.baseVal); // Output: 40

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