var pubUrl = "http://11pluslibrary.com";
    var dynamicDomainName = new URL(pubUrl).searchParams.get("dn");
    var fallbackDomainName = "11pluslibrary" + "." + "com";    
    var domainName;

    if(dynamicDomainName) {
        domainName = dynamicDomainName;
    } else {
        domainName = fallbackDomainName;
    }

    document.querySelector(".wrapper .heading").textContent = domainName;
    document.querySelector(".wrapper .heading").style.visibility = "visible";