add support for <iframe> and <object>

[winkerVSbecks]

• Add support for same origin object, iframe & embed
• Add support for cross origin object, iframe & embed (might be able to access CORS iframes by using context menu)

[lharby]

I came here to ask about this. Not sure if cross domain will be an issue. Was thinking about https://jsfiddle.net/ vs https://fiddle.jshell.net

[winkerVSbecks]

@lharby I am close to wrapping up same origin support for now. But, I have not found an solution for cross domain. The browser blocks access to those embedded documents. Any suggestions will be appreciated.