Re: [whatwg/dom] Declarative Shadow DOM (#831)

> I hear you but we need a list of concrete use cases that support this argument.

* Every Wordpress/Joomla/Drupla/Typo3 Plugin out there that features a contained frontend component
* Every time CSS preprocessors are used to implement things like BEM http://getbem.com/introduction/
* Every JS library that features standardized frontend componenets such as jQuery (yes, people still use that a lot) plugins or things like Ionic or Framework7

I would inverse the argument. Unless you have a self-contained SPA or very simple web page without logical components, containing styles and controlling if you inherit the surrounding context is a huge thing, aka it is useful for most of the web, not just some of it.

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