How to display source code such as Python, JavaScript, C#, Lua etc


I had a glance at that Ionic2 can support to display the source code in the ion-content.But now I forgot, can you tell me if you remember this tag’s name?
I just want to display the code like this :

var element = document.getElementById("#ionic-content");
element.innerHTML = ........;
alert("Hello, your are the best!")