slowdown.js

var SPEED = 40;
var TEXT = 'Site loading slowly? Without net neutrality, this could become the norm. Learn more at <a href="http://www.theopeninter.net/">theopeninter.net/</a>.'

var overlay = document.createElement('div');
overlay.innerHTML = '<p>' + TEXT + '</p>';
var docHeight = document.body.scrollHeight;

overlay.style.display = 'block';
overlay.style.position = "fixed";
overlay.style.left = "0px";
overlay.style.bottom = "0px";
overlay.style.zIndex = "100";
overlay.style.backgroundColor = 'white';
overlay.style.width="100%";
overlay.style.height = docHeight + "px";
overlay.style.textAlign = "center";
overlay.style.padding = "30px";
overlay.style.fontFamily = "sans-serif";

document.body.appendChild(overlay);

var newHeight = docHeight;
var interval = window.setInterval(function(){
        newHeight = newHeight - 5;
        overlay.style.height = newHeight + "px";
        overlay.style.bottom = "0px";
        
        if (newHeight < 1) {
                clearInterval(interval);
        }
}, SPEED);