From the NOF WIKI link you provided this seems to be simply a box where you can paste some HTML code, like in other similar web editors.
Now the most interesting question is: Is the HTML code you paste in this box rendered in the design view? Because in other similar website editors this is not rendered in the design view.
Please make me the favor and try the following: Insert the following code in the web-snippet box and tell me whether it is rendered in the design view:
Code:
<p>I am a <i>piece</i> of <b>HTML</b> code</p>
Maybe you could make a screenshot of the result in design view.
If it gets rendered in design view I will buy a NOF2015 license straightaway.