React does not use Shadow Dom. And React is not related to CSS first-hand, though people are trying apply the same modularization principles of DOM encapsulatio

React does not use Shadow Dom. And React is not related to CSS first-hand, though people are trying apply the same modularization principles of DOM encapsulation to the CSSOM. Not only that - there's a lot of implication that come with Shadow Dom that will make it impossible to just plug and play with React. Namely, the fact that is stops the cascading effect of Cascading Style Sheets. Whereever you are stylizing large swathes of your app with common css code, you'll need to rethink by either treating css as a module and importing at the new shadow root, or by rewriting your css to be more redundant. These tradeoffs require considerable buy-in, which leads me to suspect React will continue to be agnostic towards shadow dom.