getElementById(id)

<svg
  id="exampleSVG"
  width="200"
  height="200"
  xmlns="http://www.w3.org/2000/svg">
  <circle id="circle1" cx="100" cy="100" r="50" fill="blue" />
</svg>
<button id="getElementButton">Get Element</button>
<p id="elementDisplay"></p>

const svgElement = document.getElementById("exampleSVG");
const getElementButton = document.getElementById("getElementButton");
const elementDisplay = document.getElementById("elementDisplay");

getElementButton.addEventListener("click", () => {
  const circleElement = svgElement.getElementById("circle1");
  if (circleElement) {
    elementDisplay.textContent = `Element found: ${circleElement.tagName}`;
  } else {
    elementDisplay.textContent = "Element not found.";
  }
});