HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>ariaOrientation MDN</title>
</head>
<body>
  <div
    id="handle_zoomSlider"
    role="slider"
    aria-orientation="vertical"
    aria-valuemin="0"
    aria-valuemax="17"
    aria-valuenow="14"
    tabindex="0"
  >
    <span>11</span>
  </div>
  <pre id="out"></pre>
  <script>
    var el = document.getElementById("handle_zoomSlider");
    var lines = [el.ariaOrientation];
    el.ariaOrientation = "horizontal";
    lines.push(el.ariaOrientation);
    document.getElementById("out").textContent = lines.join("\n");
  </script>
</body>
</html>

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Element.ariaOrientation — MDN set horizontal (Try It)