User:Dodoïste/Sandbox3

This only works with the script at fr:MediaWiki:Gadget-New-collapsible-box.js and fr:MediaWiki:Gadget-New-collapsible-box.css. Oh, the collapsible buttons are in french, "enrouler/dérouler", replace it with "hide/show".

 My collapsible navbox  Some content.