If I see a gap between two lines of text, and that gap vanishes when I commit the document to the web or save it to a file, then it’s not ‘WYSIWYG’. But this has been my experience with 100% of such editors.
I propose a new acronym to replace ‘wizzy-wig’:
WYSMBWYGIYLBIACWBFRTWNBMCTYSSIYUC
What You See Might Be What You Get if You’re Lucky but it Almost Certainly Won’t Be For Reasons That Will Never Be Made Clear to You So Suck it Ya Ugly Cunt
Not as pithy, but at least it’s accurate.
As shitty as Google is, I’ve been messing about with Google Sites for one project, and I’ve been quite impressed with its WYSIWYG accuracy.
Your options there are limited (which probably plays into how it’s so good), but what it shows you as you build it is pretty much exactly how the website will look when you publish it.