How do I add a combinator to my style?
You can only add combinators to child selectors. Add a child selector and combinator will appear in the Style tree.
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You can create more than one template to provide layout and style alternatives with the use of the template selector.
Yes, this is possible by creating a custom element.
You don't. You apply a Descendant selector. These use a (Space).
Custom styles are CSS styles for classes.