Yes, I would love this feature to return. Not having it is probably the 
single most annoying thing with using Polymer for me.

I started designing an extensible set of UI components in the brief period 
when the feature was available and it was great! However, shortly 
afterwards it was removed and I had to instead use containment, which for a 
lot of situations is not nearly so neat. It seems completely logical to me 
to be able to inherit the basic look/layout of a component when creating 
another component that extends from it. 

I'm not entirely sure why the feature was removed as it worked well. I 
think I read somewhere that other browsers were having trouble implementing 
it, but if Chrome managed it, I can't see why they couldn't.

Here's hoping there's some news of it's return soon!

Mark


On Tuesday, June 11, 2013 at 4:36:58 PM UTC+1, Jan Miksovsky wrote:
>
> In porting a component framework to custom elements, I've hit a 
> significant hurdle in creating a custom element that can both derive from, 
> and populate the visual presentation of, a base element. Because the 
> problem description got more involved than can comfortably fit in a 
> discussion board post, I've written a blog post on the problem: 
> http://blog.quickui.org/2013/06/11/puzzle-define-html-custom-element-subclasses-that-can-fill-in-base-class-insertion-points/
> .
>
> Any thoughts or suggestions from this community would be much appreciated!
>

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