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Like the `background-foo` longhand properties (except `background-color`), `background` allows multiple layers to be defined, separated by commas. A layer does not necessarily contain something to actually draw! This parses as a `BackgroundStyleValue`, holding a `StyleValueList` for each property. This is mostly to make expansion into longhands simpler - if we had a list of `BackgroundStyleValue`s instead, one per layer, then we would have to break it up per-property anyway when computing styles.