That's hardly true when it comes to CSS3 stuff that's been around for a decade.
Moreover, it's unfair to insist on portability when comparing native vs. Web without doing the same on the native side.
Moreover, it's unfair to insist on portability when comparing native vs. Web without doing the same on the native side.
There plenty of deployment scenarios with other kinds of browsers.
Of course it is fair, using something like Qt, wxWidgets, or even roll our own was never as complicated to get pixel perfect UI across OSes.