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mat-expansion-panel keeps contents of collapsed panels in DOM · Issue #20680 · angular/components · GitHub
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Angular Error NG8001: is not a known element Angular component, then verify part of this module - YouTube
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Accessibility: Expansion-panel header is not marked as focused when tabbing. · Issue #14569 · angular/components · GitHub
Tepmlate Parse Error: 'mat-accordian' is not a known element · Issue #8917 · angular/components · GitHub
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