Started getting "is not a known element" in vscode editor, yet ng serve works fine · Issue #887 · angular/vscode-ng-language-service · GitHub
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Accessibility: Expansion-panel header is not marked as focused when tabbing. · Issue #14569 · angular/components · GitHub
![mat-expansion-panel example (Self aware panel) on material.angular.io doesn't work · Issue #8567 · angular/components · GitHub mat-expansion-panel example (Self aware panel) on material.angular.io doesn't work · Issue #8567 · angular/components · GitHub](https://user-images.githubusercontent.com/934190/33047821-9c963bbe-ce0c-11e7-85e5-7b134e050236.png)
mat-expansion-panel example (Self aware panel) on material.angular.io doesn't work · Issue #8567 · angular/components · GitHub
![mat-expansion-panel "opens" with angular enter-leave animations, although current state is closed. · Issue #11765 · angular/components · GitHub mat-expansion-panel "opens" with angular enter-leave animations, although current state is closed. · Issue #11765 · angular/components · GitHub](https://user-images.githubusercontent.com/3656278/53063817-619f6000-347a-11e9-9e88-19d896beeb16.png)
mat-expansion-panel "opens" with angular enter-leave animations, although current state is closed. · Issue #11765 · angular/components · GitHub
mat-expansion-panel - styles get messed up if panel is a child of another element · Issue #13419 · angular/components · GitHub
Tepmlate Parse Error: 'mat-accordian' is not a known element · Issue #8917 · angular/components · GitHub
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Beginner: How/ where to import expansion? error: 'mat-panel-description' is not a known element: : r/angular
![Angular Error NG8001: is not a known element Angular component, then verify part of this module - YouTube Angular Error NG8001: is not a known element Angular component, then verify part of this module - YouTube](https://i.ytimg.com/vi/EcIXA-DptI4/sddefault.jpg)