Do component content entities have view modes?
No. Component content entities do not have view modes.
No. Component content entities do not have view modes.
No. Site Studio allows the site builder to select, either use of IMCE or Entity browser for browsing and selecting images.
If you're removing styling from a base style, those styles still apply until you have saved the base style.
You can only add combinators to child selectors. Add a child selector and combinator will appear in the Style tree.
Base styles are CSS styles for HTML elements.
Yes, the component link field supports both internal and external URLs.
No, the entity browser does not work for component defaults as the entities are content, not config.
You don't. You apply a Descendant selector. These use a (Space).
The Youtube video embed is responsive so it should expand to the width of its parent. If you do need to set a width you can apply the Width CSS property through the Style Builder.
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