blur()

<svg xmlns="http://www.w3.org/2000/svg" width="200" height="200">
  <circle id="myCircle" cx="100" cy="100" r="50" tabindex="0" fill="blue" />
  <button id="focusButton">Focus the circle</button>
  <button id="blurButton">Blur the circle</button>
</svg>

const circle = document.getElementById("myCircle");
const focusButton = document.getElementById("focusButton");
const blurButton = document.getElementById("blurButton");

// Focus the circle when the "Focus" button is clicked
focusButton.addEventListener("click", () => {
  circle.focus();
});

// Blur the circle when the "Blur" button is clicked
blurButton.addEventListener("click", () => {
  circle.blur();
});