It doesn't render anything. But I was worried about performances mainly. 
Also for debugging purpose it would be a bit easier if not there, as not 
needed for my case.

Thanks for the link and explanation.

On Monday, July 21, 2014 3:31:45 PM UTC-7, Rob Dodson wrote:
>
> While the shadow-root from A is present, it shouldn't actually render 
> anything. It's there in case you want to use the shadow element to create 
> a shadow insertion point 
> <http://www.html5rocks.com/en/tutorials/webcomponents/shadowdom-301>.
>
>
> On Sun, Jul 20, 2014 at 6:11 PM, Xavier Cochard <[email protected] 
> <javascript:>> wrote:
>
>> Hello,
>>
>> I am using 2 components A and B, both having a Template and a Script tag. 
>> Both templates also use conditional template.
>> I am confused when extending B by A, that two "#shadow-root" appear while 
>> inspecting the dom.
>>
>> <my-element-B ....>
>>   |> #shadow-root  (from B)
>>   |> #shadow-root  (from A)
>> </my-element-B>
>>
>> Is there a way to only see B such as:
>>
>> <my-element-B ....>
>>   |> #shadow-root  (from B)
>> </my-element-B>
>>
>> In that sense I only want to extends the prototype and fully override the 
>> Template.
>>
>> Thanks
>> Xavier
>>
>> (using chrome 36 and latest polymer)
>>
>>
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>

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