two directional scroll view

Question

I would like to have a linearlayout with a header section on top and a webview below. The header will be short and the webview may be longer and wider than the screen.

Answer 1

Is a ScrollView nested inside a HorizontalScrollView a good idea?

Yes, and no.

Yes, my understanding is that ScrollView and HorizontalScrollView can be nested.

No, AFAIK, neither ScrollView nor HorizontalScrollView work with WebView.

I suggest that you have your WebView fit on the screen.