Some grid stuff (grid-area, justify-items, justify-self) missing

[adcar]

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Description

Some grid properties are missing. Not sure if I'm missing some, I just noticed these after looking at CSS-Tricks.

grid-area
justify-items
justify-self

Example screenshot:

[winstliu]

Looks like grid-area has been added but justify-items/self are still missing.

[adcar]

@50Wliu Only problem with grid-area is that the name of the area (example in this case) is greyed out.

[abaracedo]

I created a PR for adding support to justify-items and justify-self.