<!DOCTYPE html>
<html>
<head>
<script src="../../resources/js-test.js"></script>
</head>
<body>
<script>
description('The connected subframe counter should not overflow and make `disconnectSubframes` leave active subframes in a detached DOM node.');
jsTestIsAsync = true;

const FRAME_COUNT = 1024;

onload = () => {
    container = document.getElementById("testContainer");
    for (let i = 0; i < FRAME_COUNT; ++i) {
        setTimeout(() => {
            let frame = document.createElement('iframe');
            frame.style.display = 'none';
            container.appendChild(frame);
        }, 0);
    }

    setTimeout(() => {
        container.remove();

        shouldBeNull('container.firstChild.contentWindow');
        finishJSTest();
    }, 0);
}
</script>
<div id="testContainer"></div>
</body>
</html>