ok, so I did write a quick tool for 
that: https://github.com/KarstenB/csstransform and used the 
resulting 
https://github.com/KarstenB/csstransform/blob/master/bootstrap_deep.css 
but a few issues arise from that:
In Canary the /deep/'d version has priority over local declarations even 
within the element (not a good idea), so those have to be marked as 
!important
Browsers that are not aware of /deep/ fail to render anything correctly. So 
you need to provide a switch based on the fact whether applyAuthorStyle is 
supported... (very ugly)

On Wednesday, May 21, 2014 8:21:53 PM UTC+2, John Messerly wrote:
>
> Idea here: could bootstrap.css be preprocessed to add this before each 
> selector:
> * /deep/
>
> There are a few libraries out there for parsing CSS files. Probably not 
> too hard to write a script for it.
>
>
> On Wed, May 21, 2014 at 10:52 AM, 'Rob Dodson' via Polymer <
> [email protected] <javascript:>> wrote:
>
>> This is kind of where the old world bumps up against the new world. 
>> Bootstrap was never designed to work with Web Components so it's not easy 
>> to shoehorn it in.
>>
>> It sounds like what you want is for an element to know about and style 
>> its internal structure, but externally you should be able to easily theme 
>> these things so they look cohesive (probably by using /deep/). I don't 
>> think there's a quick fix way to go about that. Bootstrap (and libraries 
>> like it) will need to be rewritten to work in that model.
>>
>> FWIW, we talk about this exact issue _a lot_ and we're trying to come up 
>> with good strategies to deal with it. So definitely don't take this as 
>> dismissal in any way. It's just a tough nut to crack ;)
>>  
>>
>> On Wed, May 21, 2014 at 8:30 AM, Douglas Hubler 
>> <[email protected]<javascript:>
>> > wrote:
>>
>>> I'm in the exact same situation with Polymer and Bootstrap in fact.  I'm 
>>> blissfully productive using leaking CSS.   IMO Karsten was on the right 
>>> track w/fixing this in bootstrap, there needs a adapter to be shadow dom 
>>> aware.  Maybe there's some clever less/sass/stylus hacking to make this 
>>> painless.   If i pull in a third party set of tags that are bootstrap 
>>> based, then I should be able to apply same adapter to them as well.  If 
>>> third party has specified CSS locally, then that would be difficult I think 
>>> and would be an argument against defining them locally IMO.
>>>  
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>>
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