<script>

Click the circle to change colors.
<svg
  viewBox="0 0 10 10"
  height="120px"
  width="120px"
  xmlns="http://www.w3.org/2000/svg">
  <circle cx="5" cy="5" r="4" />

  <script>
    // <![CDATA[
    function getColor() {
      const R = Math.round(Math.random() * 255)
        .toString(16)
        .padStart(2, "0");

      const G = Math.round(Math.random() * 255)
        .toString(16)
        .padStart(2, "0");

      const B = Math.round(Math.random() * 255)
        .toString(16)
        .padStart(2, "0");

      return `#${R}${G}${B}`;
    }

    document.querySelector("circle").addEventListener("click", (e) => {
      e.target.style.fill = getColor();
    });
    // ]]></script>
</svg>