Re: [csswg-drafts] [css-content] URL fallbacks in 'content' should require type() or format()

Not `image-set()`, that's for multiple resolutions.  `image()` is 
intended for fallback, and I have a long-standing request to add 
`type()` to its arguments for precisely this reason.

(Well, `image-set()` should *also* have it, because `<picture>` can do
 so, but that's just to ignore some values, it doesn't do fallback 
based on that.)

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