Graphics scale mode doesn't seem to work in the exported HTML5. Using gideros 2018.1.1.
Tried letterbox, no scale, fit width/height, stretch. All look the same on a mobile device where the game screen doesn't fit in the device dimensions but goes outside those bounds.
Do you have to do this manually? i.e. scale every image based on application:getContentWidth/Height?
Same project on letterbox works fine with deployed apk on different android devices.