Wie kann ich mit JavaScript ein Popup-Fenster auf dem Bildschirm zentrieren?

<code class="js">const popupCenter = ({ url, title, w, h }) => {
  // Adjust for dual-screen positions
  const dualScreenLeft = window.screenLeft || window.screenX;
  const dualScreenTop = window.screenTop || window.screenY;

  // Get the screen size
  const width = window.innerWidth || document.documentElement.clientWidth || screen.width;
  const height = window.innerHeight || document.documentElement.clientHeight || screen.height;

  // Calculate the scaling factor
  const systemZoom = width / window.screen.availWidth;

  // Calculate the window's position
  const left = (width - w) / 2 / systemZoom + dualScreenLeft;
  const top = (height - h) / 2 / systemZoom + dualScreenTop;

  // Open the popup window
  const newWindow = window.open(url, title, `
    scrollbars=yes,
    width=${w / systemZoom},
    height=${h / systemZoom},
    top=${top},
    left=${left}
  `);

  // Focus the new window
  if (window.focus) newWindow.focus();
};</code>

<code class="js">popupCenter({
  url: 'http://www.xtf.dk',
  title: 'xtf',
  w: 900,
  h: 500,
});</code>