chromium/third_party/blink/web_tests/images/resources/green-circle.svg

<svg xmlns="http://www.w3.org/2000/svg" version="1.1" viewBox="0 0 100 100">
  <circle cx="50" cy="50" r="40" stroke="black" stroke-width="2" fill="red">
      <animate attributeName="fill" from="red" to="green" begin="0s" dur="0.01s" fill="freeze" />
  </circle>
</svg>