Hi all,

Following WebApps discussion last year [1] and earlier this year [2] about 
template transclusions and inheritance in shadow DOM, Jan Miksovsky at 
Component Kitchen, Ted O'Connor and I (Ryosuke Niwa) at Apple had a meeting 
where we came up with changes to the way shadow DOM distributes nodes to better 
fit real world use cases.

After studying various real world use of web component APIs as well as exiting 
GUI frameworks, we noticed that selector based node distribution as currently 
spec'ed doesn't address common use cases and the extra flexibility CSS 
selectors offers isn't needed in practice.  Instead, we propose named insertion 
"slots" that could be filled with the contents in the original DOM as well as 
contents in subclasses.  Because the proposal uses the same slot filling 
mechanism for content distributions and inheritance transclusions, it 
eliminates the need for multiple shadow roots.

Please take a look at our proposal at 

[1] https://lists.w3.org/Archives/Public/public-webapps/2014AprJun/0151.html 
[2] https://lists.w3.org/Archives/Public/public-webapps/2015JanMar/0611.html 

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