Compositions
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<summary><b>Composition Conventions</b></summary>

UI compositions represent higher-order interface complications and behaviors. Composition elements...

- ...can be complex, class-based async React components.
- ...may import other UI elements.
- ...may maintain and manipulate internal state data.
- ...must use scoped styles via CSS modules.
- ...should use BEM selectors to style descendants.
- ...can apply external styles (i.e. `margin`, `line-height`) to descendants.

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