<svg xmlns="http://www.w3.org/2000/svg" width="400" height="400">

<filter id="filter1" filterUnits="userSpaceOnUse" primitiveUnits="userSpaceOnUse">
  <feFlood flood-color="#ff0000" x="0%" y="0%" width="20%" height="20%" result="flood1"/>
  <feFlood flood-color="#0000ff" x="20%" y="20%" width="20%" height="20%" result="flood2"/>
  <feComposite in="flood1" in2="flood2" x="0%" y="0%" width="40%" height="40%" result="pair"/>
  <feTile in="pair"/>
</filter>
<g filter="url(#filter1)"></g>
</svg>