![javascript - Change ExpansionPanel arrow color on expanded parent ExpansionPanel in material-ui - Stack Overflow javascript - Change ExpansionPanel arrow color on expanded parent ExpansionPanel in material-ui - Stack Overflow](https://i.stack.imgur.com/rjax0.png)
javascript - Change ExpansionPanel arrow color on expanded parent ExpansionPanel in material-ui - Stack Overflow
![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
![Accessibility: Expansion-panel header is not marked as focused when tabbing. · Issue #14569 · angular/components · GitHub Accessibility: Expansion-panel header is not marked as focused when tabbing. · Issue #14569 · angular/components · GitHub](https://user-images.githubusercontent.com/604690/50208049-770be700-0370-11e9-91bf-47655e30350d.png)
Accessibility: Expansion-panel header is not marked as focused when tabbing. · Issue #14569 · angular/components · GitHub
![Accessibility: Expansion-panel header is not marked as focused when tabbing. · Issue #14569 · angular/components · GitHub Accessibility: Expansion-panel header is not marked as focused when tabbing. · Issue #14569 · angular/components · GitHub](https://user-images.githubusercontent.com/604690/50208041-72dfc980-0370-11e9-846a-afc792e9cc08.png)