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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>ariaDetailsElements get</title>
</head>
<body>
  <button aria-details="details1 details2">Button text</button>
  <span id="details1">Details 1 information about the element.</span>
  <span id="details2">Details 2 information about the element.</span>
  <pre id="out"></pre>
  <script>
    var buttonElement = document.querySelector("button");
    var lines = ["aria-details: " + buttonElement.getAttribute("aria-details")];
    if ("ariaDetailsElements" in Element.prototype) {
      var buttonElements = buttonElement.ariaDetailsElements;
      lines.push("count: " + buttonElements.length);
      var text = buttonElements.map(function (e) { return e.textContent.trim(); }).join(" ");
      lines.push("Accessible details: " + text.trim());
    } else {
      lines.push("ariaDetailsElements not supported by browser");
    }
    document.getElementById("out").textContent = lines.join("\n");
  </script>
</body>
</html>

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Element.ariaDetailsElements — MDN get (Try It)