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> "the number of CSS inline style, document.createElement('style')"

Can you expand? Which libraries, I know BEM hopes to isolate CSS styles to "components" by using strict CSS rules, but are you speaking of inline styles as they relate to JavaScript libraries like React?

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I was referring to CSS-in-JS and what is coming out of it. https://speakerdeck.com/vjeux/react-css-in-js

Not all of them use inline styles and a lot are library agnostic. Here are just some of the ones I have played with, plenty more exist.

https://github.com/rofrischmann/fela

https://github.com/FormidableLabs/radium

https://github.com/Khan/aphrodite

https://github.com/threepointone/glamor

https://github.com/MicheleBertoli/css-in-js

https://github.com/styled-components/styled-components

https://github.com/css-modules/css-modules

https://github.com/cssinjs/jss

https://github.com/smyte/jsxstyle

https://github.com/rtsao/styletron

Dynamic styling with JavaScript seems to be the best approach, allowing the browser to interpret that opens the doors to multiple security vectors. Not that JavaScript / Cookies already don't. But there would be a lot more.

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