[andai]

That's an interesting distinction. I think each resource should be self contained. Malformed HTML? HTML error. Malformed or missing image? Browser displays an image error.

The key here is that the web wasn't designed for engineers but for amateurs to slap something together sloppily in the first place.

As an aside it's curious how ridiculously forgiving HTML and JS are while CSS craps itself on a single missing semicolon. As though it were okay for the thing to be semantically and functionally malformed and malfunctioning... as long as it looks good!