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mat-expansion-panel keeps contents of collapsed panels in DOM · Issue #20680 · angular/components · GitHub
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angular - Programmatically collapsing a mat-expansion-panel gets it out-of-sync with expansion by mouse clicks - Stack Overflow
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Angular Material 9|8 Add Expansion Panel and Accordion in Angular project using Material « Freaky Jolly
![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
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angular - mat-expansion-panel, content doesnt recover his original height after closing a panel - Stack Overflow
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