Document: elementsFromPoint() メソッド

elementsFromPoint(x, y)

<div>
  <p>Some text</p>
</div>
<p>Elements at point 30, 20:</p>
<div id="output"></div>

let output = document.getElementById("output");
if (document.elementsFromPoint) {
  let elements = document.elementsFromPoint(30, 20);
  elements.forEach((elt, i) => {
    output.textContent += elt.localName;
    if (i < elements.length - 1) {
      output.textContent += " < ";
    }
  });
} else {
  output.innerHTML =
    '<span style="color: red;">' +
    "Browser does not support <code>document.elementsFromPoint()</code>" +
    "</span>";
}