post-message-popup.html | Explore in Territory

<!DOCTYPE html>
<script>
// Tries to open two popups and reports how many successfully opened.
function openPopupsAndReport() {
  var popups = 0;
  return new Promise(resolve => {
    window.addEventListener('message', function(a) {
      if (a.data == 1) {
        let popup = !!window.open();
        popups += popup ? 1 : 0;
      } else {
        resolve(popups);
      }
    });

    window.postMessage(1, document.location);
    window.postMessage(1, document.location);
    window.postMessage(2, document.location);
  });
}
</script>

chromium/chrome/test/data/popup_blocker/post-message-popup.html