Cannot show html markup in table cells

I wish to display some html code in the table cells, for example:

<h1>this is a heading</h1>

and I keep getting the escaped version displayed like this:

lt;h1gt;this is a headinglt;/h1gt;

& is in front of all lt and gt on above lines, but they get replaced – which is the behavior I want in the table cells!

what do I enter as source to make it show up as in the first example, without the lt’s and gt’s etc.

https://itsabouttheweb.com/wp/m4-standards-and-protocols-part-2-networking/