Board Thread:Support Requests - Getting Technical/@comment-1915363-20161117062030

I have a button in my Wikia that has the following class: Show All

This button is used to expand (and collapse) the hidden elements in my Wiki page design. The problem is, each ID had to be unique according to the HTML specification, which is a problem when a single class could only address one ID. I wonder is there's a way to make it so the mw-customtoggle class could target multiple mw-customcollapsible IDs?  