let testframe = document.getElementById("testframe");
testframe.onload = function() {
  parent.postMessage({
    result: "frame-allowed",
    href: document.location.href,
  }, "*");
}
testframe.onerror = function() {
  parent.postMessage({
    result: "frame-blocked",
    href: document.location.href,
  }, "*");
}
testframe.src = "file_frame_src_inner.html"
