Accordion BUG clicking two elements fast enough they both opens

[crustamet]

Prerequisites

• I have searched for duplicate or closed issues
• I have validated any HTML to avoid common problems
• I have read the contributing guidelines

Describe the issue

https://getbootstrap.com/docs/5.3/components/accordion/#example

Official Example

clicking the last and then the second element fast enough they both opened.. I thought that the animation is waiting to be finished so it could prevent the other action, but no only works on bootstrap 5.0 and it does not work on any later version..

Reduced test cases

No codepen needed as it exists on the official Bootstrap website docs

What operating system(s) are you seeing the problem on?

Windows

What browser(s) are you seeing the problem on?

Chrome

What version of Bootstrap are you using?

5.3.x

[CyrilKrylatov]

Hi, how fast?

I'm trying to do my best here but I can't reproduce.

Reproduced on Firefox 146.0b5 (aarch64)

Screen.Recording.2025-11-20.at.14.17.45.mov

[crustamet]

You already reproduced it. They should not both open. Its an accordion when you click slowly all other elements are closing and then the one you click its opening.

[CyrilKrylatov]

You already reproduced it. They should not both open. Its an accordion when you click slowly all other elements are closing and then the one you click its opening.

… yeah sorry for that, rough day and not a good night, indeed I reproduced it.

[mdo]

v6-dev rebuilds the accordion on native <details name> elements with no JavaScript, so the browser enforces single-item exclusivity synchronously — two items can't be open at once. Verified you can't double-open even by toggling all items (or forcing .open = true on all of them) in the same tick; the old JS _isTransitioning race no longer applies. Closing as resolved in v6-dev — please open a new issue if you can reproduce it on a native-<details> accordion there.