netiquette in regular use since 1994

That sounds right to me too, xara.

Here's an "invented" word that I don't mind, as it's useful and fairly clear. I'd take the meaning as something like
guidelines for politeness and understandability when communicating using the Internet or World Wide Web

I suppose etiquette implies something more formal than netiquette could ever be - but on the other hand, it's not as if the rules of etiquette were followed rigidly in every household in the world even when they were considered of the greatest importance.

[quick rant]
I'd consider it good netiquette for communications to allow for viewing on any browser and on any platform. This is the way the Web was designed, so shouldn't be a problem. But there are a lot of ill-mannered Websites out there!
[/quick rant]