Fullscreen component can't be a container in Chromium?

[mirisuzanne]

Describe the bug

Currently we define the :host as an inline-size container, but remove that in fullscreen mode. For some reason, the container property in fullscreen was causing slides to appear empty.

To Reproduce

1. Remove :not(:fullscreen) from the :host() selector at the top of the component definition
2. Use the command-period shortcut to enter fullscreen mode

Expected behaviour

It should be a normal presentation mode, but fullscreen. Instead I see empty slides.

Screenshots

Additional context

This seems to be a Chromium issue. It works fine in Safari. Firefox has other issues.