Thread:Project:Support desk/html included stylesheet and script/reply (2)

The actual document are stored in the database (As wikitext, converted to html on the fly [or possibly cached]).

In RawHTML mode you can add js using &lt;script&gt; tags. You can also add js to the page MediaWiki:Common.js on your wiki, which gets included in all pages. However you may want to consider if MediaWiki is right for your usecase here - its not really designed for custom html pages.

You may also want to look at Manual:Special_pages where you can entirely control what is being outputted.