As I see it, the issue shown in your test case is that cloning animated 
attributes does not clone the animation parameters. That’s something we will 
need to solve. We should not solve it by overriding copyNonAttributeProperties 
and hand-writing it in each class.

I don’t know enough about the SVG animated attributes support to know how to 
solve the problem myself, but you should make sure we have a bug report in 
bugs.webkit.org mentioning cloneNode and SVG animated attributes so we can 
discuss there how to fix it.

I imagine the code changes will be in SVGElement.h/cpp and 
SVGAnimatedProperty.h/cpp.

    -- Darin

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