// My code

​

function log() {

    var p = document.createElement("p"),

        text = Array.prototype.join.call(arguments, ", ");

    p.textContent = text;

    document.getElementById("console").appendChild(p);

    return text;

}

​

$("body").data("abc", "12");

​

log("data abc : "+$("body").data("abc"));

​

log("data abc : "+$("body").attr("data-abc"));

​

log("data abc : "+$("body").attr("abc"));