book/header-additions.html at main · DeclareDesign/book · GitHub

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<style type="text/css" media="print">
    body { visibility: hidden; display: none }
</style>

<script type="text/javascript">
    function createCookie(name, value, days) {
        var expires;
        if (days) {
            var date = new Date();
            date.setTime(date.getTime() + (7 * 24 * 60 * 60 * 1000));
            expires = "; expires=" + date.toGMTString();
        }
        else {
            expires = "";
        }
        document.cookie = name + "=" + value + expires + "; path=/";
    }

    function getCookie(c_name) {
        if (document.cookie.length > 0) {
            c_start = document.cookie.indexOf(c_name + "=");
            if (c_start != -1) {
                c_start = c_start + c_name.length + 1;
                c_end = document.cookie.indexOf(";", c_start);
                if (c_end == -1) {
                    c_end = document.cookie.length;
                }
                return unescape(document.cookie.substring(c_start, c_end));
            }
        }
        return "";
    }
    window.onload = () => {
      if (getCookie('popupShown') != 'yes') {
        const myModal = new bootstrap.Modal('#exampleModal');
        myModal.show();
        createCookie('popupShown', 'yes', 1)
      }
    }
</script>