I feel pretty strongly that the SVG behavior is not appropriate. I think
any sort of invalid 'filter' value, including a <filter> element with a
child element of unknown type, should cause the filtered element to be
rendered normally (i.e. 'filter' treated as 'none'). Otherwise I think
introducing new <fe> SVG element types does not get useful fallback.
Regarding Dirk's question, I don't think it matters much but I lean
slightly towards option 1. It's probably better to not apply a filter at
all than apply a possibly mangled filter.
Rob
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