I need to have fullscreen but I get this:

In developer tools I see this:

How can I make fullscreen?

  • In Project Settings / General / Display / Window / Stretch, try these settings:
    Mode - viewport
    Aspect - keep

In Project Settings / General / Display / Window / Stretch, try these settings:
Mode - viewport
Aspect - keep

    DaveTheCoder maybe you can help me with html one more time? In operaGX I have this
    In other browsers everything is ok, and in opera settings webGL2 is working

      Remember also that, if use say itch.io, you also have to enable fullscreen while uploading your HTML5 project.