Re: [webcomponents] [Shadow]: rename <content> to <slot> (bugzilla: 28561) (#92)

I guess you guys might want to read the slots proposal carefully.
Aa far as I can read from the slots proposal, [1], there is one significant change in the behavior.

- \<content\> doesn't select other \<content\> elements. It tries to select the distributed nodes of the other content elements. See http://w3c.github.io/webcomponents/spec/shadow/#dfn-pool-population-algorithm for details.
- \<slot\> selects other \<slot\> elements

[1] https://github.com/w3c/webcomponents/blob/gh-pages/proposals/Slots-Proposal.md

That's the reason I have a concern.

In \<content\>, I guess developers doesn't get confused by `::content`  because content elements never select other content elements.
In \<slot\>, developers might get confused by `::slot` because slot elements *select* other select elements.

It is also worth noting that '::content' is always used with a left side selector, such as "content::content". "#abc::content", in practical.

"::content" might be okay, but it should be avoided in practical because "*::content" is very wasteful. "content::content" can replace "::content" unconditionally.

I guess the same thing applies for slots elements.
- "::content" can be replaced with "slot::content", and it should be recommended to avoid unnecessary selector matching.



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