[apunic]

What is the shadow DOM in Safari and will it interfere with React JS?

[masklinn]

There is no relation between shadow dom and react.

[kibibu]

Perhaps they were thinking of http://www.polymer-project.org/?

[chc]

I think it was just a confusion between Shadoe DOM and React's virtual DOM, which is basically a pure-JavaScript doppelgänger of the real DOM for your React components.