[Documentation] Explain how ::ng-deep works #65718
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Clarify usage of Angular's ::ng-deep pseudo class and its implications for global styles.
This is a documentation-only change, that explains how
::ng-deepactually works, explaining in effect what was mentioned in #25160.I will also be proposing a change to the discouragement line - though I expect it will require more discussion since it explicitly engages "the Angular team" - to only discourage CSS rules where
::ng-deepappears at the start of the rule / applies to the whole selector.In my view, it is perfectly useful and legitimate to want a component to have style authority on both its template and the children that it's provided with. It's even less drastic than the other ViewEncapsulation modes.