CSS offers a lot of very intriguing features that would benefit KML. The simple effect would be separating styling from the geometry. In KML 2.1, any Feature (abstract element for other KML elements) can have an id. Subsequently, KML3 could add a class attribute, like in HTML, that could loosely be used to give some categorization of the Feature (road, highway, animal, newt). Then, the CSS could reference these id, class, or even use selectors to apply styling to elements.

the css ideas are largely unimplementable in a well-performing manner in 3d. you can tell that the people in that discussion have a web background.

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