working

add_to_index_html.html

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+<script src="seasonals/christmas.js"></script>
+<link rel="stylesheet" href="seasonals/christmas.css">
+<div class="christmas-container"></div>

christmas.css

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+.christmas-container {
+  display: block;
+  pointer-events: none;
+  z-index: 0;
+  overflow: hidden;
+}
+
+.christmas {
+  position: fixed;
+  top: -10%;
+  font-size: 1em;
+  color: #fff;
+  font-family: Arial, sans-serif;
+  text-shadow: 0 0 5px #000;
+  user-select: none;
+  -webkit-animation-name: christmas-fall, christmas-shake;
+  -webkit-animation-duration: 10s, 3s;
+  -webkit-animation-timing-function: linear, ease-in-out;
+  -webkit-animation-iteration-count: infinite, infinite;
+  cursor: default;
+  animation-name: christmas-fall, christmas-shake;
+  animation-duration: 10s, 3s;
+  animation-timing-function: linear, ease-in-out;
+  animation-iteration-count: infinite, infinite;
+}
+
+@-webkit-keyframes christmas-fall {
+  0% {
+    top: -10%;
+  }
+
+  100% {
+    top: 100%;
+  }
+}
+
+@-webkit-keyframes christmas-shake {
+
+  0%,
+  100% {
+    -webkit-transform: translateX(0);
+    transform: translateX(0);
+  }
+
+  50% {
+    -webkit-transform: translateX(80px);
+    transform: translateX(80px);
+  }
+}
+
+@keyframes christmas-fall {
+  0% {
+    top: -10%;
+  }
+
+  100% {
+    top: 100%;
+  }
+}
+
+@keyframes christmas-shake {
+
+  0%,
+  100% {
+    transform: translateX(0);
+  }
+
+  50% {
+    transform: translateX(80px);
+  }
+}
+
+.christmas:nth-of-type(0) {
+  left: 0%;
+  animation-delay: 0s, 0s;
+}
+
+.christmas:nth-of-type(1) {
+  left: 10%;
+  animation-delay: 1s, 1s;
+}
+
+.christmas:nth-of-type(2) {
+  left: 20%;
+  animation-delay: 6s, 0.5s;
+}
+
+.christmas:nth-of-type(3) {
+  left: 30%;
+  animation-delay: 4s, 2s;
+}
+
+.christmas:nth-of-type(4) {
+  left: 40%;
+  animation-delay: 2s, 2s;
+}
+
+.christmas:nth-of-type(5) {
+  left: 50%;
+  animation-delay: 8s, 3s;
+}
+
+.christmas:nth-of-type(6) {
+  left: 60%;
+  animation-delay: 6s, 2s;
+}
+
+.christmas:nth-of-type(7) {
+  left: 70%;
+  animation-delay: 2.5s, 1s;
+}
+
+.christmas:nth-of-type(8) {
+  left: 80%;
+  animation-delay: 1s, 0s;
+}
+
+.christmas:nth-of-type(9) {
+  left: 90%;
+  animation-delay: 3s, 1.5s;
+}
+
+.christmas:nth-of-type(10) {
+  left: 25%;
+  animation-delay: 2s, 0s;
+}
+
+.christmas:nth-of-type(11) {
+  left: 65%;
+  animation-delay: 4s, 2.5s;
+}

christmas.js

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+const christmas = true; // enable/disable christmas
+const randomChristmas = true; // enable random Christmas
+const randomChristmasMobile = false; // enable random Christmas on mobile devices
+const christmasCount = 25; // count of random extra christmas
+
+
+let msgPrinted = false; // flag to prevent multiple console messages
+
+// function to check and control the christmas
+function toggleChristmas() {
+  const christmasContainer = document.querySelector('.christmas-container');
+  if (!christmasContainer) return;
+
+  const videoPlayer = document.querySelector('.videoPlayerContainer');
+  const trailerPlayer = document.querySelector('.youtubePlayerContainer');
+  const isDashboard = document.body.classList.contains('dashboardDocument');
+  const hasUserMenu = document.querySelector('#app-user-menu');
+
+  // hide christmas if video/trailer player is active or dashboard is visible
+  if (videoPlayer || trailerPlayer || isDashboard || hasUserMenu) {
+    christmasContainer.style.display = 'none'; // hide christmas
+    if (!msgPrinted) {
+      console.log('Christmas hidden');
+      msgPrinted = true;
+    }
+  } else {
+    christmasContainer.style.display = 'block'; // show christmas
+    if (msgPrinted) {
+      console.log('Christmas visible');
+      msgPrinted = false;
+    }
+  }
+}
+
+// observe changes in the DOM
+const observer = new MutationObserver(toggleChristmas);
+
+// start observation
+observer.observe(document.body, {
+  childList: true,    // observe adding/removing of child elements
+  subtree: true,      // observe all levels of the DOM tree
+  attributes: true    // observe changes to attributes (e.g. class changes)
+});
+
+// Array of christmas characters
+const christmasSymbols = ['❆','🎁', '❄️', '🎁', '🎅' , '🎊','🎁', '🎉'];
+
+function addRandomChristmas(count) {
+  const christmasContainer = document.querySelector('.christmas-container'); // get the christmas container
+  if (!christmasContainer) return; // exit if christmas container is not found
+
+  console.log('Adding random christmas');
+
+  for (let i = 0; i < count; i++) {
+    // create a new christmas element
+    const christmasDiv = document.createElement('div');
+    christmasDiv.classList.add('christmas');
+
+    // pick a random christmas symbol
+    christmasDiv.textContent = christmasSymbols[Math.floor(Math.random() * christmasSymbols.length)];
+    
+    // set random horizontal position, animation delay and size(uncomment lines to enable) 
+    const randomLeft = Math.random() * 100; // position (0% to 100%)
+    const randomAnimationDelay = Math.random() * 8; // delay (0s to 8s)
+    const randomAnimationDelay2 = Math.random() * 5; // delay (0s to 5s)
+
+    // apply styles
+    christmasDiv.style.left = `${randomLeft}%`;
+    christmasDiv.style.animationDelay = `${randomAnimationDelay}s, ${randomAnimationDelay2}s`;
+
+    // add the christmas to the container
+    christmasContainer.appendChild(christmasDiv);
+  }
+  console.log('Random christmas added');
+}
+
+// initialize standard christmas
+function initChristmas() {
+  const christmasContainer = document.querySelector('.christmas-container') || document.createElement("div");
+
+  if (!document.querySelector('.christmas-container')) {
+    christmasContainer.className = "christmas-container";
+    christmasContainer.setAttribute("aria-hidden", "true");
+    document.body.appendChild(christmasContainer);
+  }
+
+  // create the 12 standard christmas
+  for (let i = 0; i < 12; i++) {
+    const christmasDiv = document.createElement('div');
+    christmasDiv.className = 'christmas';
+    christmasDiv.textContent = christmasSymbols[Math.floor(Math.random() * christmasSymbols.length)];
+
+    christmasContainer.appendChild(christmasDiv);
+  }
+}
+
+// initialize christmas and add random christmas symbols after the DOM is loaded
+document.addEventListener('DOMContentLoaded', () => {
+  if (!christmas) return; // exit if christmas is disabled
+  initChristmas();
+  toggleChristmas();
+
+  const screenWidth = window.innerWidth; // get the screen width to detect mobile devices
+  if (randomChristmas && (screenWidth > 768 || randomChristmasMobile)) { // add random christmas only on larger screens, unless enabled for mobile devices
+    addRandomChristmas(christmasCount);
+  }
+});

test-site.html

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+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Christmas Display</title>    
+    <style>
+        body {
+            background-color: black;
+        }
+    </style>
+</head>
+
+<body>
+    <script src="christmas.js"></script>
+    <link rel="stylesheet" href="christmas.css">
+    <div class="christmas-container"></div>
+</body>
+
+</html>