Is there a polyfill for the onchanged cookie?

Question

Internet Explorer

https://developer.mozilla.org/en-US/docs/Mozilla/A...
Faced a problem of such a plan that the script does not have time to catch the cookie in the browser.
The script has a defer and it runs only on documentready (everything is somewhat more complicated there, but simplified for this event)

IE - version 11.0.9600.19596 ---- (wrong behavior)
chrom - Version 85.0.4183.121 (Official build), (64 bit) -
firefox works fine - version 81.0 (64-bit) --- (incorrect behavior)

the code that now, I want to rewrite on events, but as always IE
Advise something? or hardcode the delay while the scripts are poking around and writing these cookies?

// failback - guid сайта для записи хоть чего то
 function detectLmsId(failback) {
        /*
        document.cookie
    "WSS_FullScreenMode=false; lms_siteinfo=4cb0ec00-c17c-475f-96ed-879e814159bb|97|3"
        */
        var cookie = document.cookie;
        var cookietoken = 'lms_siteinfo='
        var cp = cookie.indexOf(cookietoken)

        if (cp > 0) {
            cookie = cookie.substr(cp + cookietoken.length, 36);
            return cookie
        }
        return failback
}

PS. Still firefox. He's weird too. The question is more about why it's weird.

Answer 1

In general, my answer was not satisfactory.
Decided to start a timer that pulls the function until this parameter is changed.
According to the logs, somewhere in 400ms, this all fits. Works on all 3 browsers plus mobile safari