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https://dvcs.w3.org/hg/FXTF/raw-file/tip/filters/index.html#drop-shadowltshadowgt https://dvcs.w3.org/hg/FXTF/raw-file/tip/filters/index.html#feDropShadowStdDeviationAttribute
I fixed it in the last commit. The text normatively references CSS3-BG and notices the difference.