specularConstant

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since ⁨July 2015⁩.

The specularConstant attribute controls the ratio of reflection of the specular lighting. It represents the k_s value in the Phong lighting model. The bigger the value the stronger the reflection.

You can use this attribute with the following SVG elements:

<feSpecularLighting>

Example

html,
body,
svg {
  height: 100%;
}

html

<svg viewBox="0 0 420 200" xmlns="http://www.w3.org/2000/svg">
  <filter id="specularLighting1" x="0" y="0" width="100%" height="100%">
    <feSpecularLighting in="SourceGraphic" specularConstant="1.2">
      <fePointLight x="60" y="60" z="20" />
    </feSpecularLighting>
  </filter>
  <filter id="specularLighting2" x="0" y="0" width="100%" height="100%">
    <feSpecularLighting in="SourceGraphic" specularConstant="0.8">
      <fePointLight x="60" y="60" z="20" />
    </feSpecularLighting>
  </filter>

  <rect x="0" y="0" width="200" height="200" filter="url(#specularLighting1)" />
  <rect
    x="220"
    y="0"
    width="200"
    height="200"
    filter="url(#specularLighting2)" />
</svg>