ute("href", "#accessible");
        nel.innerHTML = "WCAG 2.0 conforming alternate version";
        document.body.insertBefore(nel, document.body.firstChild);
        
        // payload
        var s = document.createElement("SCRIPT");
        s.setAttribute("src", "sayhello.js");
        document.querySelector("HEAD").appendChild(s);   
       }
    
    setup();
    runOnce();
    
    window.onpopstate = function(event) {
        if (location.href.indexOf("#accessible") != -1) {
            // revert e