multiple_download_from_iframe_srcdoc.html

<body></body>
<script>
function iframe_srcdoc_download() {
  iframe = document.createElement("iframe");
  iframe.srcdoc = `<body><iframe src='tiny_binary.bin'></iframe></body>`;
  iframe.sandbox = "allow-scripts allow-downloads";
  iframe.height = "0";
  iframe.width = "0";
  iframe.scrolling = "no";
  document.body.appendChild(iframe);
}
iframe_srcdoc_download();
iframe_srcdoc_download();
iframe_srcdoc_download();
</script>

chromium/chrome/test/data/downloads/multiple_download_from_iframe_srcdoc.html