How can I use the span class spoilerblur. I am not the admin of the wiki and there are no admins in this wiki. Is there any way to do this
There are several methods. Personally, I like this one because it does not require custom CSS/JS and works on mobile too:
Text <span class="mw-collapsible mw-collapsed" data-expandtext="Show Spoiler">'''spoiler text'''</span> Other text.
Edit: I have missed the part that you said you are not an admin. In this case, the method above will be the only one. Or you may start an adopting process and become an admin.
Please give us a link to the wiki anyway.
That wiki seems to have no admins or bureaucrats... I wonder why?
What do you think?