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feature) expansion panel: secondary content & description alignment · Issue #5173 · angular/components · GitHub
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mat-expansion-panel keeps contents of collapsed panels in DOM · Issue #20680 · 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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Accessibility: Expansion-panel header is not marked as focused when tabbing. · Issue #14569 · angular/components · GitHub
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mat-expansion-panel "opens" with angular enter-leave animations, although current state is closed. · Issue #11765 · angular/components · GitHub
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