Identifies input for the given filter primitive. The value can be either one of six keywords (see above) or can be a string which matches a previous result attribute value within the same filter element. If no value is provided and this is the first filter primitive, then this filter primitive will use SourceGraphic as its input. If no value is provided and this is a subsequent filter primitive, then this filter primitive will use the result from the previous filter primitive as its input.
If the value for result appears multiple times within a given filter element, then a reference to that result will use the closest preceding filter primitive with the given value for attribute result. Forward references to results are an error.
- Scalable Vector Graphics: Filter Effects, Section 15.7.2
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