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I am seeing css styles in javascript more and more now. Is this a performance thing?

I believe it's more of a convenience, and React-based projects are setup for it. You can avoid dealing with the global cascade and there's no need to maintain a parallel set of files for styling; it's all in the JavaScript.

Worth noting that the same author created a fairly popular library for JS styles: https://github.com/casesandberg/reactcss

It's more about getting locally-scoped, composable CSS than performance. It's similar in concept to CSS Modules.

Glitch in chrome: https://share.viewedit.com/hpHseCYcRVRFowSoxWEV2H

Glitchy in Firefox 47, Ubuntu 15.10

https://snag.gy/1ELC2A.jpg

Did you get permission from Slack to rip off their emoji picker like this?

Along the same lines, did you get permission from Henry to use his name?

It's like 95% similar to the builtin mac picker. (ctrl+command+space)

Show HN: React Reactions – Slack, Pokemon, GitHub, Facebook and YouTube Pickers