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`@font-face` rules cannot contain nested selectors. Nor can they be nested under a selector. Normally this would be a syntax error by the author of the styles. But in some rare cases, such as importing styles from a library, and applying `:host ::ng-deep` to the imported styles, we can end up with broken css if the imported styles happen to contain `@font-face` rules. This commit works around this problem by sanitizing such cases (erasing any scoping selectors) during emulated ShadowDOM encapsulation style processing. Fixes #41751 PR Close #41815