<!DOCTYPE html>
<html>
<body>
<script src="../../resources/js-test.js"></script>
<script>

description('This tests navigating away from a document after setting a selection deletes the document.');
jsTestIsAsync = true;

function appendIframe()
{
    const iframe = document.createElement('iframe');
    document.body.appendChild(iframe);
    iframe.contentDocument.body.innerHTML = '<p>hello</p>';
    return iframe;
}

function setEditorStates(iframe)
{
    iframe.contentDocument.designMode = 'on';
    iframe.contentWindow.getSelection().setPosition(iframe.contentDocument.body, 1);
    iframe.contentDocument.execCommand('bold', false, null);
}

function wait(duration)
{
    return new Promise(function (resolve) {
        setTimeout(resolve, 0);
    });
}

var frame;
var initialDocumentCount;
async function runTest()
{
    initialDocumentCount = internals.numberOfLiveDocuments();

    let frames = [];
    const count = 200;
    for (let i = 0; i < count; ++i)
        frames.push(appendIframe());

    await wait(0); // Make sure the transient document created by inserting an iframe is removed.
    GCController.collect();

    for (let frame of frames)
        setEditorStates(frame);

    await wait(0); // Wait for UI update timer to fire.

    let resolved = 0;
    for (let frame of frames) {
        frame.src = "resources/select-iframe-focusin-document-crash-frame.html";
        frame.onload = async () => {
            ++resolved;
            if (resolved !== count)
                return;
            let before = internals.numberOfLiveDocuments();
            await wait(0);
            GCController.collect();
            let after = internals.numberOfLiveDocuments();
            let delta = before - after;
            if (delta > 0.15 * count)
                debug("PASS freed more than 15% of documents");
            else
                debug("FAIL freed less than 15% of documents");
            finishJSTest();                
        };
    }
}

if (!window.GCController || !window.internals) {
    debug('This test requires GCController and internals');
} else {
    // Clear out any lingering documents from the previous tests.
    GCController.collect();
    GCController.collect();
    runTest();
}

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