How to get HTML5 to fit / fill different resolutions? (Q)

Hi guys!
I cant wrap my head around how to get my HTML5 game fill or fit inside the browsers / window on different devices with different resolutions.

So far I made the scaling with CSS but that takes the interactivity away.

So all hints, advice tips are welcome.

I tried with some javascript but cant get the canvas to be drawn.

Best regards/ Daniel

I'm still working (fighting) on this. I´m trying with iframes for now

As long as I tick "Resize display to fill window size" it seams to scale properly.
(thanks to Please login to see this link. who explained)
A landscape project scales fine, a portrait project scales fine.

But it seams that the orientation of the scale is bound to the width and height settings of the project and cannot be changed in run time nor between frames.

I'm working on a project that will have one landscape layout an one portrait layout.
If anyone know anything about adjusting this, feel free to tell