I added Template:Gravid_About to include a page, and included them through iframe in a normal html page: TestPage.html. The result is not as expected, the inclusion still shows header and footer. I had expected to see only the text
I have now tested in Opera, Vivaldi, Chrome, and Safari.
All of them have the header with them.
Mac OS issue? - I can't believe that the OS affects the view in the browser.
Have I forgotten something in the Wiki as packages?
Something really weird going on here! On my Linux and Windows systems I do not see the header. I was suspicious that Opera may have been ignoring the CSS, but would not expect WebKit based browsers to.
However, I've just tested on a borrowed Air and the header is showing as you say. I'll have to further investigate. It must be something to do with the way WebKit handles iFrames. Unfortunately differences between browser engines are all to common :(
Okay, something really odd going on here. It works if you are logged into the CWI site. But if you are not logged in, the CSS is ignored and you see the header etc. Never seen that before! It must be something to do with the skin.
Oh my, this was really very simple in the end! If you are logged in, it will use the skin you have set in your preferences by default. In my case I'd set the BIF skin as the default so I could test it.
For everyone else it will pick up the default skin for the page. As the Template:Gravid_About page resides in the main namespace, the default skin is the CWI one. So the CSS I told you to use was to hide the header etc for the BIF skin. Result - logged in as me the header etc is hidden, logged out default skin it was not.
I have simply added CSS on the template to hide the elements on the CWI skin. All seems to be working now :)