node-webkit has special support to let you load external websites in an iframe in your application. 3 attributes nwdisable, nwfaketop and nwUserAgent of the iframe element are introduced to do this:

• nwdisable (since 0.5.0) is used to disable Node support in the iframe and make it a Normal frame (see Security)
• nwfaketop (since 0.5.1) is used to trap the navigation and the access (such as window.top, window.parent) in this iframe.
• nwUserAgent (since 0.9.0-rc1) is used to specify the User-Agent header of HTTP requests. See Changes-to-DOM

For more discussion, see https://github.com/rogerwang/node-webkit/issues/534

More features which would help on this topic:

• Window.eval(), inject-js-start, inject-js-end, document-start and document-end in Window
• Ignoring X-Frame-Options HTTP header. See Security.