It is actually relevant: https://developer.mozilla.org/en-US/docs/Web/Web_Components/Using_shadow_DOM https://developer.mozilla.org/en-US/docs/Web/Web_Component

It is actually relevant: https://developer.mozilla.org/en-US/docs/Web/Web_Components/Using_shadow_DOM https://developer.mozilla.org/en-US/docs/Web/Web_Components/... Support for it only exists on Chrome at the moment (https://caniuse.com/#search=shadow%20dom https://caniuse.com/#search=shadow%20dom), but things like Angular are already geared up to use it for encapsulating styles, but defaulting to an emulated mode that is essentially css-modules: https://angular.io/guide/component-styles#view-encapsulation https://angular.io/guide/component-styles#view-encapsulation