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https://dvcs.w3.org/hg/csswg/raw-file/tip/cssom/Overview.html#the-cssstyledeclaration-interface [[ [TreatNullAs=EmptyString] attribute DOMString cssFloat; ]] I had to make this a partial interface in the source file instead of part of the CSSStyleDeclaration.idl file because the build system seems to drop the [TreatNullAs=EmptyString] extended attribute on the floor when using [Documentation="...", TreatNullAs=EmptyString] attribute DOMString cssFloat;
https://dvcs.w3.org/hg/csswg/rev/9ccea5fe11d4