Easily: poor scrolling, slow, shadows at the end of the web views (that the iPhone SDK forces in there (!)), etc. It's fairly easy to tell on an iPhone if somet

Easily: poor scrolling, slow, shadows at the end of the web views (that the iPhone SDK forces in there (!)), etc. It's fairly easy to tell on an iPhone if something is JavaScript or not, it's one of the reasons I don't use anything that's been near PhoneGap or whatever.