Two or more panels can be opened in an accordion at one time by clicking the links before animation completes.

Created by: u353

Step 1. Navigate to this page: http://getbootstrap.com/javascript/#collapse Step 2. Click on one of the links that trigger opening of the accordion sections (ie. Collapsible Group Item #1) Step 3. Before the section's opening animation has a chance to complete (the one from 'Step 2' above) click on a different link to trigger opening a second panel (ie. Collapsible Group Item #2)

At this point you should see that you have two accordion panels open at the same time.