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Was in SVG 1.1: http://www.w3.org/TR/SVG11/filters.html#InterfaceSVGFEConvolveMatrixElement Gone in Filter Effects: http://www.w3.org/TR/filter-effects/#InterfaceSVGFEConvolveMatrixElement The preserveAlpha content attribute is still there, so this looks like an accidental removal.
Ping?
I don't think we removed it accidentally but can't remember why we would have done. Seems indeed odd. Maybe Ed can remember?
Moved to https://github.com/w3c/fxtf-drafts/issues/114