Adobe Illustrator: InnerShadowExample SVG FIlter

<filter  id="InnerShadowExample">
  <!-- Shadow Offset -->
  <feOffset
    dx='5'
    dy='5'
  />

  <!-- Shadow Blur -->
  <feGaussianBlur
    stdDeviation='3'
    result='offset-blur'
  />

  <!-- Invert the drop shadow to create an inner shadow -->
  <feComposite
    operator='out'
    in='SourceGraphic'
    in2='offset-blur'
    result='inverse'
  />

  <!-- Color & Opacity -->
  <feFlood
    flood-color='black'
    flood-opacity='0.75'
    result='color'
  />

  <!-- Clip color inside shadow -->
  <feComposite
    operator='in'
    in='color'
    in2='inverse'
    result='shadow'
  />

  <!-- Put shadow over original object -->
  <feComposite
    operator='over'
    in='shadow'
    in2='SourceGraphic'
  />
</filter>