function ok(a, msg) {
  postMessage({ type: "status", status: !!a, msg });
}

onmessage = function(event) {
  // URL.href throws
  var url = new URL("http://www.example.com");
  ok(url, "URL created");

  var status = false;
  try {
    url.href = "42";
  } catch (e) {
    status = true;
  }
  ok(status, "url.href = 42 should throw");

  url.href = "http://www.example.org";
  ok(true, "url.href should not throw");

  status = false;
  try {
    new URL("42");
  } catch (e) {
    status = true;
  }
  ok(status, "new URL(42) should throw");

  status = false;
  try {
    new URL("http://www.example.com", "42");
  } catch (e) {
    status = true;
  }
  ok(status, "new URL(something, 42) should throw");

  postMessage({ type: "finish" });
};