Comment 7 for bug 195320

The specification of feImageElement:

This filter primitive refers to a graphic external to this filter element, which is loaded or rendered into an RGBA raster and becomes the result of the filter primitive.

This filter primitive can refer to an external image or can be a reference to another piece of SVG. It produces an image similar to the built-in image source SourceGraphic except that the graphic comes from an external source.

https://www.w3.org/TR/SVG/filters.html#feImageElement

So I suppose you could make a case that this filter element isn't intended to be used on the same object, but there's nothing explicit. What do other svg editors/renderers do in this situation?