<h5>hello world!</h5><p>this is a sample block.</p><style>h5{background:red}</style><script>({init:function(t){var n,e=this;t==null&&(t={});this.root=t.root;n=document.createElement("div");this.root.appendChild(n);console.log("init!");this.c=0;return setInterval(function(){n.innerText=e.c;return e.c++},1e3)}});</script>