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v2.0.0 - Powered by Emotion

Under the hood, v2.0.0 is now running an enhanced "fork" of [Emotion](https://github.com/emotion-js/emotion).
Previously, Fancy's internals was a custom from-scratch implementation that
worked very similarly as Styled Components/Emotions and CSS Modules.

Fancy was originally created to be a super tiny CSS-Modules client-side
compiler. This worked wonderfully! After implementation, we realized that Fancy
_needed_ to support:

- Scoping
- Theming
- iFrame support (out-of-the-box)

Fancy v1.x did support these features, but they weren't reliable. This is
because the core CSS processing functionally for something like CSS Modules
is very different compared to something like Styled Components (with theming).

Rather than reverse engineer things to make it fit, it was decided that v2.x
would use Emotion.

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