Why IS My Website Not rendering

Without seeing your website, none of us can say with certainty as to what is wrong with it.

Keep in mind though, programs and web browsers use a variety of rendering engines for parsing the HTML and CSS. Just because your code meets W3C standards, doesn't mean that every rendering engine will live up to the standards. In fact, none of them do.

And as Village said above, WYSIWYG editors are essentially toys - they are more of a marketing feature for novices than anything else. Anyone serious in web development will steer clear of those editors as they're impractical in their existing state of rendering. Especially since no one is going to be browsing the web through an editor as such.

Also, if you're not seeing any styling at all - perhaps you've incorrectly linked the stylesheet. Be sure to check the paths to all files and images.

So you suggest I stick to Notepad?