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<!doctype html>
<html>
<head>
<title>Reuse of iframe about:blank document execution context</title>
<link rel="author" title="Dan Clark" href="mailto:daniec@microsoft.com">
<link rel="help" href="http://www.w3.org/html/wg/drafts/html/master/browsers.html#sandboxing">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
<h1>Reuse of iframe about:blank document execution context in sandbox="allow-scripts" iframe</h1>
<script type="text/javascript">
async_test(t => {
let iframe = document.createElement("iframe");
document.body.appendChild(iframe);
let iframeAboutBlankDocument = iframe.contentDocument;
assert_equals(iframeAboutBlankDocument.URL, "about:blank");
iframe.sandbox = "allow-scripts";
iframe.src = './sandbox-new-execution-context-iframe.html';
iframe.onload = t.step_func_done(() => {
assert_equals(iframe.contentDocument, null,
"New document in sandboxed iframe should have opaque origin");
assert_equals(Object.getPrototypeOf(iframeAboutBlankDocument).changeFromSandboxedIframe, undefined,
"Sandboxed iframe contents should not have been able to mess with type system of about:blank document");
let iframeAboutBlankContents = iframeAboutBlankDocument.querySelectorAll('body');
assert_equals(iframeAboutBlankContents[0].tagName, "BODY",
"about:blank document's contents should still be accessible");
});
},"iframe with sandbox should load with new execution context");
</script>
<div id="log"></div>
</body>
</html>
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