I must've forgotten to file this bug before, sorry.
to support urls for CSS cursor properties, nsIWidget::SetCursor(imgIContainer*)
needs to be implemented for the window.
bug 38447 implemented this for windows and gtk2.
(Bug 286306 implemented it for OS/2)
(Note that Bug 286303 will change the signature of this function a bit)
as far as i remember, BeOS R5 allows only b/w (1 bit colordepth, 1 bit/pix for
white transparency, 16*16 pix size) cursors , so we may loose most of possible