OK, what other method could you have to scroll a div/iframe? It was the first one that I thought might work, so I tried it. Unless I'm mistaken that made it intuitive for me.

I do get your point though - for some people it's not obvious...

Why not use the same mechanism you use to scroll the main document window?

because then if the iframe covers the whole screen, it'd be impossible to scroll the document?

I would expect the standard scrolling gesture to scroll the iframe -- unless the iframe is already scrolled all the way in that direction, in which case it applies the scroll to the iframe's container.

This behavior is intuitive, if slightly inconvenient in some cases, which is exactly the trade-off I'd have expected Apple to make. Requiring an unfamiliar multitouch gesture for a common operation strikes me as the kind of "let's do something cool because we can" geekery that got us middle-click-to-paste in X Windows.

I'm curious: what does the iPhone use to scroll an iframe in an iframe? Three fingers?

Sorry for the off topic comment but I have to say... I love middle-click-to-paste in X Windows! Hooray geekery.

"Intuitive" means I did similar things a hundred times in the past.