To display HTML means showing HTML codes so other can copy or see examples of them. There are two different ways to display HTML on. Keep on reading this tutorial if you want to know more.
1. The first way: Most websites probably use this one. This is also the easiest way to let your visitors copy your code, and it looks very professional. Paste your codes where it says Code Here!
2. The second way: This code will show the HTML code as text, so you can show examples with it. It is called XPM.