Re: [w3c/webcomponents] Support Custom Pseudo-elements (#300)

I think we should have an allowed/blocked list of properties to be applied for each part.

Given we have custom properties, I think we should focus on the use cases that aren't served by custom properties, namely `::part`, first especially since forward declaring a part would allow nested styling as well.

Also, some component may want to override the theme coming from the outside since if the component requires a sub-component to always use a specific theme. e.g. a button component inside a social share button may always need to use its social network's theme color, and not page's theme color.

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