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)`;
}

if (document.readyState === "loading") {
  document.addEventListener("DOMContentLoaded", randomizeUserSmiley);
} else {
  randomizeUserSmiley();
}