feGaussianBlur-3.svg

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<svg xmlns="http://www.w3.org/2000/svg" width="500" height="500">

<filter id="f1" filterUnits="userSpaceOnUse" primitiveUnits="userSpaceOnUse">

  <feGaussianBlur in="SourceGraphic" stdDeviation="10" result="blur"/>

  <feFlood flood-opacity="0" flood-color="black"/>

  <feComposite in="blur" operator="over" x="100" y="100" width="100" height="100"/>

</filter>

<g filter="url(#f1)">

  <rect x="100" y="100" width="100" height="100" fill="#00ff00"/>

</g>

</svg>