I followed the steps to set up debugging webpage on iOS. It worked. However I see an issue with the inspector - it doesn't let me check the DOM and corresponding CSS. Anyone else has this issue? (Exact same issue when debugging using the simulator.)
Screenshot: http://screencast.com/t/E4fxPQwk14
Thanks!
UPDATE: WebKit nightly works. Thank you Timothy Hatcher!
You need to use a WebKit nightly, Safari 6.1 or Mavericks to use Web Inspector with iOS 7.