<!DOCTYPE HTML>
<html>
<head>
<title>Bug 1660452: NullPrincipals need to know whether they were spun off of a Secure Context</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
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<body>
<script class="testbody" type="text/javascript">
SimpleTest.waitForExplicitFinish();
ok(window.isSecureContext, "top level should be a secure context");
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let newWin = window.open("data:text/html,
