Retrieving a style property value such as fill: url(#fill) returns "#fill", when it should be "url(#fill)".
This occurs when using window.getComputedStyle as well as retrieving the property from the element style directly.
This breaks code that needs to modify such an IRI value, e.g. it can be mistaken for a hex colour.
It also breaks any code that attempts to dump the SVG programmatically, since fill: #fill is invalid.