(function() {
    // running in private context, no namespace pollution :-)

    var delay = 250; // each 250 ms, content height will be checked
    var current_height = 0; // assume starting height is 0px

    // other arguments are passed in URL, for example:
    //  http://www.wdfiles.dev/local--html/start/5d5a0384a922dd96ac0db81d715a5bf348d43c57/www.wikidot.dev/?ukey=1b91d581807e1ba924db3d456f2b8f43b51a1ea0
    //  ^ keep the same protocol (http/https)    ^ iframe hash to pass when resizing      ^ original domain     ^ authorization key
    var url_array = location.toString().split('/');
    var iframe_hash = url_array[5];
    var random = Math.random();
    var resize_div_id = 'div_' + iframe_hash + random;
    var resize_iframe_id = 'iframe_' + iframe_hash + random;
    var resize_url = url_array[0] + '//' + url_array[6] + '/common--javascript/resize-iframe.html';
    //               ^ http:               ^ www.wikidot.dev (original domain)

    var get_height = function() {
        if (document.body.scrollHeight) {
            return document.body.scrollHeight;
        }
        if (document.height) {
            return document.height;
        }
        return document.body.offsetHeight;
    };

    var resize = function() {
        var div = document.getElementById(resize_div_id);

        var old_iframe = document.getElementById(resize_iframe_id);
        if (old_iframe) {
            div.removeChild(old_iframe);
            delete old_iframe;
        }

        var iframe = document.createElement("iframe");
        iframe.id = resize_iframe_id;
        iframe.src = resize_url + "?" + Math.random() + "#" + current_height + "/" + iframe_hash;
        div.appendChild(iframe);
    };

    // every <delay> miliseconds:
    // if height changed from last time, do resize
    var tick = function() {
        var new_height = get_height();
        if (new_height != current_height) {
            current_height = new_height;
            resize(current_height);
        }
        setTimeout(tick, delay);
    };
    
    var init = function() {
        var div = document.createElement("div");
        div.id = resize_div_id;
        div.setAttribute('style', 'display: none');
        div.style.display = 'none'; // this way it works even in IE
        document.body.appendChild(div);
        tick();
    };
    
    var old_onload = window.onload;
    window.onload = function() {
        if (typeof(old_onload) == "function") {
            old_onload();
        }
        init();
    };
})();


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