What's the Best Alternative to the Deprecated `::ng-deep` Selector in Angular?

Alternative to Deprecated :ng-deep Selector in Angular

In Angular, styling elements placed by the router-outlet has been traditionally achieved using the ::ng-deep selector. However, this selector is now deprecated.

Alternatives to ::ng-deep

Currently, there is no direct replacement provided by Angular. This is because the W3C spec for Shadow DOM, which initially included selectors like ::deep, has removed this recommendation without providing a replacement. As such, Angular continues to support ::ng-deep and its alternatives in deprecated state until an official W3C standard emerges.

Why is ::ng-deep Deprecated?

The deprecation of ::ng-deep is due to the pending state of the W3C draft specification on CSS Scoping, which is working on a set of selectors specifically designed for Shadow DOM elements. Once approved, this spec is expected to provide a robust solution for styling elements within shadow trees. Angular may not need to implement its own selectors after this specification is implemented in browsers.

Recommendation

While waiting for a standardized solution from W3C, it is recommended to continue using ::ng-deep and its alternatives. The deprecation is primarily intended for future-proofing, not immediate removal.

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