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What does "CSS-in-JS" mean as a general styling approach, and what problem does it aim to solve compared to traditional separate CSS files?

In this round
  1. What does "CSS-in-JS" mean as a general styling approach, and what problem does it aim to solve compared to traditional separate CSS files?
  2. What is the general relationship between Emotion and the broader category of "atomic CSS-in-JS" or "zero-runtime CSS-in-JS" libraries that have emerged more recently (like vanilla-extract or Linaria)?
  3. What does Emotion's `styled` API (e.g. `styled.div`...``) provide, and how does it compare to using the `css` prop directly?
  4. What is `@emotion/styled`, and how does it relate to the more general `@emotion/react` package?
  5. What is a common reason Emotion is often used alongside a component library or design system, such as MUI (Material UI)?
  6. What is a general reason a team might specifically avoid dynamic, per-render style interpolation (styles that change on every single render based on rapidly-changing values, like a live scroll position) with a runtime CSS-in-JS library, even though the capability technically exists?
  7. What is Emotion's theming support, and how does a `ThemeProvider` typically work?
  8. What is a "global style" in Emotion (via the `Global` component or `injectGlobal`/similar API), and when might it be appropriate to use, given CSS-in-JS's general emphasis on component-scoped styling?
  9. What is the purpose of Emotion's support for "composing" styles, e.g. combining a base set of styles with additional, conditional styles?
  10. How would you style a React component using Emotion's `css` prop (or the `css` function combined with `className`)?
  11. What is Emotion?
  12. What is a reasonable practical guideline for a team deciding whether Emotion's dynamic, prop-driven styling capability is actually needed for a given component, versus using a simpler, static styling approach for that same component?
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