collapse show bootstrap 5

 https://www.w3schools.com/bootstrap5/bootstrap_collapse.php

https://getbootstrap.com/docs/5.0/components/collapse/?#usage

https://www.w3schools.com/bootstrap/bootstrap_ref_js_collapse.asp

https://www.w3schools.com/bootstrap/tryit.asp?filename=trybs_ref_js_collapse_simple&stacked=h

https://getbootstrap.com/docs/5.2/components/collapse/

https://www.tutorialrepublic.com/twitter-bootstrap-tutorial/bootstrap-collapse.php

https://getbootstrap.com/docs/4.0/components/collapse/

https://www.w3schools.com/bootstrap5/tryit.asp?filename=trybs_collapsible_in&stacked=h

https://www.tutorialrepublic.com/codelab.php?topic=bootstrap&file=creating-collapsible-element-via-data-attributes