Running game inside a DIV

I want to place a game canvas inside a DIV so it can be positioned within a web page and made somewhat responsive for desktop/mobile.

Seems like supplying your own UT_CANVAS might be a way to go, but it doesn't work. The size is overwritten regardless of its position/parent, so the game ends up displaying fullscreen anyway. Hacking the code somewhat further I can get it to drawn within the DIV, but the scale is wrong.

I guess running inside an iFrame might work, but it would be nice to avoid that if possible.

Anyone got a way to achieve this without hacking the runtime code too much?

 

In case anyone else is interested, hacking the code inside

Code (JavaScript):

1. html.onDisplayUpdated

and

Code (JavaScript):

1. html.setCanvasSize

can more or less achieve what I want, but I'd love to hear if there's a cleaner way.