html - I want to close other opened panel when one is expanded and other section will be closed - Stack Overflow
Bootstrap Collapse Toggle
Bootstrap 4 | Collapse - GeeksforGeeks
Bootstrap Collapse Toggle
Navbar not collapsed by default · Issue #19569 · twbs/bootstrap · GitHub
angularjs - angular ui-bootstrap accordion how to achieve customized behavior: default all close, when clicking one accordion-group heading, open all others - Stack Overflow
Bootstrap 4 Collapsible Example | CSS | navbar | menu | horizontal | table | icons | js
Bootstrap 4 Collapse: Explained with 6 examples
Bootstrap Collapse Toggle
Repeater: Collapse all by default and accordion style · Issue #4801 · octobercms/october · GitHub