<!DOCTYPE HTML>
<html>
<head>
  <meta charset="utf-8">
  <title>Bug 1403814: Allow toplevel data URI navigation data:application/json</title>
  <script src="/tests/SimpleTest/SimpleTest.js"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
</head>
<body>
<script class="testbody" type="text/javascript">

SimpleTest.waitForExplicitFinish();

function test_toplevel_data_json() {
  const DATA_JSON = "data:application/json,{'my_json_key':'my_json_value'}";

  let win = window.open(DATA_JSON);
  let wrappedWin = SpecialPowers.wrap(win);

  // Unfortunately we can't detect whether the JSON has loaded or not using some
  // event, hence we are constantly polling location.href till we see that
  // the data: URI appears. Test times out on failure.
  var jsonLoaded = setInterval(function() {
    if (wrappedWin.document.location.href.startsWith("data:application/json")) {
      clearInterval(jsonLoaded);
      ok(true, "navigating to data:application/json allowed");
      wrappedWin.close();
      SimpleTest.finish();
    }
  }, 200);
}

SpecialPowers.pushPrefEnv({
  set: [["security.data_uri.block_toplevel_data_uri_navigations", true]]
}, test_toplevel_data_json);

</script>
</body>
</html>
