MediaWiki:Common.js

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function randomizeUserSmiley() {
  const smileys = [
    "f/fe/Smiley_smiley",
    "3/3a/002_grin",
    "e/e5/003_tounge",
  ];

  const randomSmiley = smileys[Math.floor(Math.random() * smileys.length)];

  document.getElementById("pt-userpage").style.backgroundImage = "url(https://wiki.everybodyedits.com/images/"+randomSmiley+".png)";
}

randomizeUserSmiley();