I have a plugin that displays an iframe within a bootstrap 3 collapsible panel (similar to this: https://www.w3schools.com/bootstrap/bootstrap_collapse.asp). Clicking a link will toggle the panel.
It works for me across major browsers but another user reports an issue.
Is there a better Moodle way to achieve this? I noticed the Moodle CSS "hide" class is described as "obsolete" and the html/css general guidelines project is noted to be dead.
The iframe is used because it is displaying an embedded Moodle page (from the same site) within it.
Advice gratefully received.