Board Thread:Support Requests - Getting Technical/@comment-24553580-20190910033341/@comment-9605025-20190910211616

Both CSS and JS can be "applied to specific pages". I put that last part in quotes because MediaWiki (least how Wikia has configured it) doesn't actually let you do that. What you do is write your CSS/JS so that it has no effect on pages other than the target page; but it is still loaded for every page.

If you are using the template on only one page, I am not sure I see what the purpose of having the template is. Generally, you use templates so that you can place the same content and/or format similar content in an identical manner on multiple pages. The only common exception I am aware of is main page content. A lot of wikis use one-use templates to simplify editing the main page.