Hello.
Will it be possible to scale games in WebGL, so they can fit in a screen on a phone, tablet and web without having three different builds? I read somewhere else that it was possible to scale WebGL to fit high DPI screens.
Will this be possible for WebGL projects built with Unity?
Making your webgl context scale to the screen size should be simple. The question is whether you will want different assets for different screen sizes - in that case, you might consider using AssetBundles to download only the assets you need for the particular platform you are running on.
I imagine it’s similar to supporting different resolutions on mobile devices… The new ui system has some components to help with that, or you can create different ui for different screen sizes.