chromium/third_party/blink/web_tests/external/wpt/webstorage/resources/storage_session_window_open_second.html

<!DOCTYPE HTML>
<html>
<head>
<title>WebStorage Test: sessionStorage - second page</title>
</head>
<body>
<script>

var storage = window.sessionStorage;

var assertions = [];

assertions.push({
    actual: storage.getItem("FOO"),
    expected: "BAR",
    message: "storage.getItem('FOO')"
});

storage.setItem("FOO", "BAR-NEWWINDOW");

assertions.push({
    actual: storage.getItem("FOO"),
    expected: "BAR-NEWWINDOW",
    message: "value for FOO after changing"
});
assertions.push({
    actual: window.opener.sessionStorage.getItem("FOO"),
    expected: "BAR",
    message: "value for FOO in my opening window"
});
assertions.push({
    actual: storage.getItem("BAZ"),
    expected: null,
    message: "value for BAZ set after window.open(), is not set in new window"
});

window.opener.postMessage(assertions, '*');

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