HTML encode decode (Pure Javascript)

html(encode_decode).js

function html_decode(text){
    var div = document.createElement("div");
    div.innerHTML = text;
    return ("textContent" in div) ? div.textContent : div.innerText ;
}

function html_encode(str){
    var div = document.createElement("div");
    div[("textContent" in div) ? "textContent" : "innerText"] = str;
   return div.innerHTML;
}