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Unit test error: Router outlet is not a known element · Issue #11057 · angular/angular-cli · GitHub
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router-outlet' is not a known element ANGULAR - Stack Overflow
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html - Angular 10 Compile Error "error NG8001: 'mat-card-title' is not a known element: - Stack Overflow
router-outlet' is not a known element: Routing not working · Issue #12406 · angular/angular-cli · GitHub
解决Angular 项目中，报错: 'router-outlet' is not a known element 的问题。 - 前端技术- SegmentFault 思否
Component or directive matching router-outlet element is out of the current Angular module's scope – IDEs Support (IntelliJ Platform) | JetBrains
