Re: [csswg-drafts] [css-fonts] Specifying changes to parameters for fallback fonts

In this model, we would also have to define the priority for the CSS 
properties inside the @fallback-font-sequence rule. Because there are 
no selectors, we would have to define what to do if the element 
already has those properties set.

- Perhaps the computed style of that property on the element is 
ignored for glyphs using fallback fonts.
- Or, perhaps we only allow relative values (like percentages) in 
these properties and resolve those percentages against the element's 
computed style. (This would require modifying letter-spacing because 
it currently only accepts a length.)

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