Why the image open instead of download in javascript? [duplicate]

var url = 'https://c4.wallpaperflare.com/wallpaper/203/636/834/minimalism-landscape-digital-windows-11-hd-wallpaper-preview.jpg';

function download(source) {
  const fileName = source.split('/').pop();
  var el = document.createElement("a");
  el.setAttribute("href", source);
  el.setAttribute("download", fileName);
  document.body.appendChild(el);
  el.click();
  el.remove();
}

download(url);