It's alright, you are welcome to come back if you need further help.
I'm not entirely sure what you mean by "inline".
Also, there is no function called #ifempty. There is the #if function which is actually "if not empty".
One who actually owns a MediaWiki installation, should be able to manipulate the page's HTML beside what the MediaWiki software allows for user editable content.
However, wiki founders on Fandom don't own anything, they are merely given local admin and bureaucrat rights.
It's a glitch that happens pretty often and fixes itself later.
<data source="label1">
<label>Label1</label>
<format>some fixed text</format>
</data>
Typically <format> is used along with the specific input embedded with {{{ }}}, but it can also be used to completely ignore the value and provide a fixed text. It is only called if the parameter was provided any value at all.
I think an empty value like label1= would trigger it too, so it's best to entirely skip the parameter you don't want to appear. But if you have to ignore empty values as well then it can be done this way
<data source="label1">
<label>Label1</label>
<format>{{#if:{{{Label1|}}}|some fixed text}}</format>
</data>
Okay I'll try to help. It should be noted that while tabs are pretty common, they aren't exactly a standard feature in the tools Fandom provide, so it necessarily involves working with some level of source code.
For tabbing a portion of a larger page, there is a feature called "tabber". You can read about it in Help:Tabber but in short it works like this:
<tabber>
Title 1=
Text section 1
|-|
Title 2=
Text section 2
|-|
Title 3=
Text section 3
</tabber>
If the entire page is expected to be changed, it is better to make separate subpages named after the main one (like Harry Potter, Harry Potter/Trivia Harry Potter/Gallery) then add a navigation bar that looks like tabs but it's actually links. That bar can be added with a template like Template:Simple_tabs
Well, most likely someone in your family did it. Make sure to log out of your account every time you are done, and keep your password secret.
Which sort of tabs? Tabs of what exactly?
Fandom don't offer a built-in chat service anymore. The feature was never made compatible with the current version of the software so it's not possible to add it to any wiki.
Are you aware that Rollback is simply an easier way of reverting edits? Anyone can revert edits even without the Rollback role, it just takes a few more clicks.
If you automatically give rights to users, you would end up giving them to the vandals.
What aren't you sure about?
I think there should be equivalent parameters to the filters on the page itself: namespace, and type of link (link/transclusion/redirect). But flitering by name or stuff like that.
If you need more advanced output and filtering, there is the DPL extension which you can request enabling.
Some special pages can indeed embed their output in a page. For example:
{{Special:WhatLinksHere/Harry Potter}}
or
{{Special:WhatLinksHere/{{FULLPAGENAME}}}}
It looks like a template but it's not exactly. It shows an up-to-date copy of the given special page with the given parameters.
Please give a link to the wiki in question.
Roles aren't a privilege, they are a responsibility. The key question is whether the wiki needs said person as an admin or not.
I wouldn't say "absolutely not", but it's something for the current admins to discuss. I can imagine a good admin getting mad and leaving in anger, then coming back and saying "Sorry, I got out of proportion, I would like to come back" and the other admins can consider it.
Sure, if he's not responsible enough or the community doesn't want him then he shouldn't be given a role just because he had it in the past.
On wikis that are already on MediaWiki 1.37, there should be an option for a partial block. You can for example block someone from editing pages in the main namespace, while still letting them edit their userpage and participating in Discussions. However, I don't think you can issue a block just on creating pages.
If you have the right rail opened, under "page tools", you have a link to "page information".
There, one of the details you can see is "page length (in bytes).
The length appears in the "history" of the page too, but a bit less clearly.
If you mean during editing before saving, I don't know any easy way to do so.
Minor vandalism is still vandalism, you don't have to specify the details.
1. If you try to put 2 million words on a page, it wouldn't save. (probably. I never actually tried)
2. It wouldn't save way before that, around 2 million bytes. Every letter holds one byte or more.
3. Normally you shouldn't even get close to this limit, pages aren't supposed to be that long.
<div style="background:cyan; border:1px solid black;">
text
</div>