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f87b454fa9
CSSFontFaceRule now stores its values as a CSSFontFaceDescriptors, with a ParsedFontFace produced on request. This is exposed via the `style` attribute, so we pass a lot of tests that try to read values from that. We have one test regression, which we passed by mistake before: The test wanted to ensure we don't allow `@font-face` nested inside other rules. We passed it just because we discarded any `@font-face` without a `font-family`. What we're supposed to do is 1) keep at-rules with missing required descriptors and just not use them, and 2) reject certain ones when nested. We may want to cache the ParsedFontFace in the future, but I didn't here because 1) it's called rarely, and 2) that would mean knowing to invalidate it when the CSSFontFaceDescriptors changes, which isn't obvious to me right now.