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Re:Ask HN: ReactJS – Do you use it? Do you like it? by ziahamza on Saturday June 20, 2015 @10:33PM (#9751912)
React is a pain to use with web components. The event handling in React blows up when it is rendered under shadow DOM, so building chrome extension through React can be a bit of pain.

They are aware of the issue, but too slow in responding to pull requests and mostly reject them for being 'not good enough'

Re:Ask HN: ReactJS – Do you use it? Do you like it? by spicyj on Sunday June 21, 2015 @03:36AM (#9752572)
When we accept a pull request, we have to support that code forever, so I hope you'll excuse us for being a little bit picky in what we accept.

Shadow DOM event support should be in 0.14.