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<!doctype html>
<meta charset="utf-8">
<title>window.top: `null`</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<script>
async_test(function (t) {
var iframe = document.createElement('iframe');
iframe.onload = t.step_func_done(() => {
var iWindow = iframe.contentWindow;
/**
* `top` should return the top-level browsing context but will return
* `null` if none exists, such as when any of the BC's ancestor browsing
* context container's document elements are disconnected/removed.
*/
assert_equals(iWindow.top, window);
document.body.removeChild(iframe);
assert_equals(iWindow.top, null);
});
document.body.appendChild(iframe);
}, '`window.top` is null when browsing context container element removed');
async_test(t => {
var iframe = document.createElement('iframe');
var iframe2, removedEl;
var testFunc = t.step_func(() => {
var frameWindow = iframe.contentWindow;
var frame2Window = iframe2.contentWindow;
assert_equals(frameWindow.top, window);
assert_equals(frame2Window.top, window);
iframe.removeEventListener('load', nestFrame);
iframe2.removeEventListener('load', testFunc);
removedEl = document.body.removeChild(iframe);
assert_equals(frameWindow.top, null);
assert_equals(frame2Window.top, null);
removedEl.addEventListener('load', t.step_func_done(() => {
// reattached iframe's browsing context will report window.top
assert_equals(removedEl.contentWindow.top, window);
// removed/re-added iframes will have new browsing context / window
assert_equals(frameWindow.top, null);
assert_equals(frame2Window.top, null);
}));
document.body.appendChild(removedEl);
});
var nestFrame = function () {
iframe2 = iframe.contentDocument.createElement('iframe');
// Workaround for https://bugzilla.mozilla.org/show_bug.cgi?id=1229707
iframe2.src = '/common/blank.html';
iframe2.addEventListener('load', testFunc);
iframe.contentDocument.body.appendChild(iframe2);
};
iframe.addEventListener('load', nestFrame);
document.body.appendChild(iframe);
}, '`window.top`null when any ancestor browsing context container removed');
</script>
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