The Filter Effects spec [1] defines the syntax for texture parameter values: <param-name> <param-value> <param-value> texture(<uri> | <filter-primitive-reference>) This bug covers parsing texture(<uri>). [1]: https://dvcs.w3.org/hg/FXTF/raw-file/tip/filters/index.html#feCustomElement
*** Bug 71442 has been marked as a duplicate of this bug. ***