The constructor for Iconset violates custom element requirements

[cuberoot]

Expected Behaviour

We should be able to create an iconset derivative without errors

Actual Behaviour

Latest Chrome canary is flagging a problem and won't create an iconset because it adds an attribute to itself in the constructor. That violates the spec

Reproduce Scenario (including but not limited to)

Steps to Reproduce

Platform and Version

Sample Code that illustrates the problem

Logs taken while reproducing problem

[benjamind]

I think we can close this now, can you confirm @cuberoot ?

[cuberoot]

Yep