Re: [spec-reviews] CSS Variables (#41)

Getting/setting API is absolutely there - they're *properties*, so you just use the normal property API.  Because of naming, you can't use the easy `style.foo` API, but `style.getPropertyValue()` is an old and well-established API.

Observing changes is indeed difficult, and is being addressed in Houdini <http://drafts.css-houdini.org/css-properties-values-api/>.  Getting Variables out the door required keeping it extremely lean; it was the very first extension point CSS had ever grown!

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