Object doesn't support property or method 'closest'

I just got the info that my jQuery function is not working on IE nor Edge. In the console I have the message:

Object doesn't support property or method 'closest'

This is the jQuery:

$('body').on('change', 'select', function (event) {
    if(event.target.id.indexOf("couche") >= 0) {
        $.ajax({
            url: "{{ redir2 }}",
            type: "POST",
            data: {
                ident: event.target.id,
                value: event.target.value,
                iscouche: "True"
            },
        }).done(function (msg) {
            if(msg.nothing == 1) {
                var what = event.target.closest('tbody');
                $(what).find("tr:gt(0)").remove();
            } else {
                var add = event.target.closest('tr');
                var toremove = msg.toremove.split(" ");
                for(var i = 0; i < toremove.length; i++) {
                    if(toremove[i].length > 0) {
                        jQuery(toremove[i]).remove();
                    }
                }
                jQuery(add).after(msg.ret);
            }
        });

    } else {
        $.ajax({
            url: "{{ redir2 }}",
            type: "POST",
            data: {
                ident: event.target.id,
                value: event.target.value,
                iscouche: "False"
            },
        }).done(function (msg) {});
    }
});

Can someone tell me if there's a fix for that?