Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can download Universal WebGL Template Free.
Universal WebGL Template v1.2.1
This package contains a customizable template for your WebGL builds.
– The only WebGL template that allow your game content to use all the available space in the web browser.(Not like default full screen support)
– Adaptative interface to fit minimum and maximum aspect-ratio.
– Optional button to switch between the web browser windowed and default fullscreen modes.
– Easily customize your template and loading bar.
– Improved management of non supporting WebGL plateforms and redirection support.
– Detailed documentation included
Should you encounter any issue, please contact us and we will be happy to help : [email protected]
Fullscreen Demo
Min max aspect-ratio Demo