SVG JS baseValue bindings should call parseMappedAttribute Currently they call svgAttributeChanged(const QualifiedName& attrName) Which has caused bugs like: https://bugs.webkit.org/show_bug.cgi?id=25383 The correct fix would be for us to untangle how updating works, and for the JS parsing to go through the same code as the xml parser does, namely parseMappedAttribute
Can't elaborate as I'm about to sleep, but SVG js baseValue bindings use that on purpose. If you track back the commit log you'll see it has been introduced to add XML attribute <-> JS attribute synchronization support. I can tell more in the following days.