Feature request: CSS Grid Support

[ksdhans]

It would be great if litehtml supported CSS grid.

Being able to use CSS grid would make it easier to build layouts that are responsive to window size change. It eliminates the need for some of the Javascript hacks that people use (which litehtml doesn't support, because it's an HTML/CSS layout engine, not a full browser with Javascript).

See this video for an explanation on how CSS grid simplifies responsive layouts:
https://www.youtube.com/watch?v=7kVeCqQCxlk

Here are his example layouts:
https://codepen.io/collection/DdOKgm/