Template:USERNAME/doc

Description: Adds the username of the registered Fandom user who is viewing the page. If no user is logged in, the supplied alt text is displayed instead.
Syntax: {{USERNAME|<alt text>}}; Optional alt text is what is displayed when no user is logged in. If nothing is supplied as alt text, users will see "<insert name here>" when not logged in.
Examples: {{USERNAME|style=code}} is the best. will show "you is the best."; If not logged in, you see… will show "<insert name here> is the best."; [[Special:Mypage|{{USERNAME|Visitor}}'s userpage is good too]]. will show "Visitor's userpage is good too."; If not logged in, you see… "Visitor's userpage is good too."
Dependencies: Add the following to the wiki's ImportJS file. This is preferred.

dev:InputUsername/code.js

Or add the following to the wiki's common js page.

importArticles({
    type: "script",
    articles: [
        "u:dev:MediaWiki:InputUsername/code.js"
    ]
});