<!DOCTYPE html>
<meta charset="utf-8">
<title>navigator.credentials frame tests</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<body></body>
<script>
  promise_test(async t => {
    let PROBE_CREDENTIALS = "<script>window.parent.postMessage(String(navigator.credentials), '*');<\/script>";

    let frame = document.createElement("iframe");
    const loadPromise = new EventWatcher(t, frame, "load").wait_for("load");
    frame.src = "data:text/html," + PROBE_CREDENTIALS;
    document.body.append(frame);
    await loadPromise;

    let eventWatcher = new EventWatcher(t, window, "message");
    const { data } = await eventWatcher.wait_for("message");
    assert_equals(data, "undefined");
  }, "navigator.credentials should be undefined in documents generated from `data:` URLs.");
</script>