chokes on `grid-area` property.

We need to update `css-property-parser` with the latest support for properties and handle unknown properties transparently.

Start at the css-property-parser entry point and inspect how grid-area and unknown properties are handled. Confirm the parser supports the latest properties and preserves unknown properties transparently; the issue does not name files or tests, so locate the relevant coverage before changing anything.

Written by the indexing model from the issue text.