File: frame_recursive_target.html

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thunderbird 1%3A140.4.0esr-1
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<!DOCTYPE html>
<iframe id="static"></iframe>
<script>
    const name = "frame_recursive_target";
    const url = location.href;
    const iframe = document.querySelector("iframe");
    let isCrossOrigin = false;
    try {
        window.parent.location.hostname;
    } catch (_) {
        isCrossOrigin = true;
    }

    addEventListener("load", async () => {
        await new Promise(resolve => {
            iframe.addEventListener("load", resolve);
            if (!isCrossOrigin) {
                iframe.name = name;
            }

            iframe.src = url;
        });

        if (isCrossOrigin) {
            const innerWin = iframe.contentWindow.document.querySelector("iframe");
            await new Promise(resolve => {
                innerWin.addEventListener("load", resolve);
                window.open(url, name);
            });
        }
    });
</script>