test_window_proxy_unlinked_inner.html

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This test gets skipped with pattern: os == 'linux' && os_version == '24.04' && arch == 'x86_64' && debug && verify-standalone
Manifest: dom/base/test/mochitest.toml

<!DOCTYPE HTML>

<html>

<head>

<meta charset="utf-8">

<title>Test that a WindowProxy whose inner window has been unlinked is not exposed</title>

<script src="/tests/SimpleTest/SimpleTest.js"></script>

<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>

</head>

<body>

<script>

add_setup(async function init() {

  await SimpleTest.promiseFocus(window);

})

add_task(async function test_window_proxy_unlinked_inner() {

  let frame = document.createElement("iframe");

  document.body.append(frame);

  let win = frame.contentWindow;

  win.cycle = new win.MessageEvent("cycle", {data: win});

  // The two events keep the native BrowsingContext and outer alive, not

  // the JS global.

  let windowHolders = {

    message: new MessageEvent("hold", {source: win}),

    ui: new UIEvent("hold", {view: win}),

};

  let windowWeakRef = new WeakRef(win);

  frame.remove();

  is(windowHolders.message.source, win,

     "MessageEvent.source can expose a live detached window");

  is(windowHolders.ui.view, win,

     "UIEvent.view can expose a live detached window");

  frame = null;

  win = null;

  await SimpleTest.promiseWaitForCondition(() => {

    // Check after every CC, before another GC can collect the JS wrapper

    // and conceal a stale native cache.

    SpecialPowers.DOMWindowUtils.garbageCollect();

    SpecialPowers.DOMWindowUtils.cycleCollect();

    return windowWeakRef.deref() === undefined;

  }, "The detached window has been collected")

  is(windowWeakRef.deref(), undefined,

     "Check that the detached window has been collected");

  is(windowHolders.message.source, null,

     "MessageEvent.source must not expose an unlinked window");

  is(windowHolders.ui.view, null,

     "UIEvent.view must not expose an unlinked window");

});

</script>

</body>

</html>