From Get docs
< @angular/coreAngular/docs/9/api/core/app id



A DI Token representing a unique string id assigned to the application by Angular and used primarily for prefixing application attributes and CSS styles when ViewEncapsulation.Emulated is being used.

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const APP_ID: InjectionToken<string>;


If you need to avoid randomly generated value to be used as an application id, you can provide a custom value via a DI provider configuring the root Injector using this token.

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