first rel

add_to_index_html.html

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+<link rel="stylesheet" href="/web/seasonal/halloween.css">
+<div class="halloween-container" aria-hidden="true">
+    <div class="halloween"> <img src="/web/seasonal/ghost_20x20.png"> </div>
+    <div class="halloween"> <img src="/web/seasonal/bat_20x20.png"> </div>
+    <div class="halloween"> <img src="/web/seasonal/pumpkin_20x20.png"> </div>
+    <div class="halloween"> <img src="/web/seasonal/ghost_20x20.png"> </div>
+    <div class="halloween"> <img src="/web/seasonal/bat_20x20.png"> </div>
+    <div class="halloween"> <img src="/web/seasonal/pumpkin_20x20.png"> </div>
+    <div class="halloween"> <img src="/web/seasonal/ghost_20x20.png"> </div>
+    <div class="halloween"> <img src="/web/seasonal/bat_20x20.png"> </div>
+    <div class="halloween"> <img src="/web/seasonal/pumpkin_20x20.png"> </div>
+    <div class="halloween"> <img src="/web/seasonal/ghost_20x20.png"> </div>
+    <div class="halloween"> <img src="/web/seasonal/bat_20x20.png"> </div>
+    <div class="halloween"> <img src="/web/seasonal/pumpkin_20x20.png"> </div>
+</div>

halloween.css

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

halloween.js

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+const halloween = true; // enable/disable halloween
+
+let msgPrinted = false; // flag to prevent multiple console messages
+
+// function to check and control the halloween
+function toggleHalloween() {
+  const halloweenContainer = document.querySelector('.snow-container');
+  if (!halloweenContainer) 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 halloween if video/trailer player is active or dashboard is visible
+  if (videoPlayer || trailerPlayer || isDashboard || hasUserMenu) {
+    halloweenContainer.style.display = 'none'; // hide halloween
+    if (!msgPrinted) {
+      console.log('Halloween hidden');
+      msgPrinted = true;
+    }
+  } else {
+    halloweenContainer.style.display = 'block'; // show halloween
+    if (msgPrinted) {
+      console.log('Halloween visible');
+      msgPrinted = false;
+    }
+  }
+}
+
+// observe changes in the DOM
+const observer = new MutationObserver(toggleHalloween);
+
+// 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)
+});
+
+const images = [
+    "/web/seasonal/ghost_20x20.png",
+    "/web/seasonal/bat_20x20.png",
+    "/web/seasonal/pumpkin_20x20.png",
+    "/web/seasonal/ghost_20x20.png",
+    "/web/seasonal/bat_20x20.png",
+    "/web/seasonal/pumpkin_20x20.png",
+    "/web/seasonal/ghost_20x20.png",
+    "/web/seasonal/bat_20x20.png",
+    "/web/seasonal/pumpkin_20x20.png",
+    "/web/seasonal/ghost_20x20.png",
+    "/web/seasonal/bat_20x20.png",
+    "/web/seasonal/pumpkin_20x20.png",
+];
+
+// create halloween objects
+function createHalloween() {
+    const container = document.querySelector('halloween-container') || document.createElement("div");
+    
+    if (!document.querySelector('halloween-container')) {
+        container.className = "halloween-container";
+        container.setAttribute("aria-hidden", "true");
+        document.body.appendChild(container);
+    }
+
+    images.forEach(imageSrc => {
+        const halloweenDiv = document.createElement("div");
+        halloweenDiv.className = "halloween";
+
+        const img = document.createElement("img");
+        img.src = imageSrc;
+
+        halloweenDiv.appendChild(img);
+        container.appendChild(halloweenDiv);
+    });
+}
+
+
+// initialize halloween after the DOM is loaded
+document.addEventListener('DOMContentLoaded', () => {
+  if (!halloween) return; // exit if halloween is disabled
+  createHalloween();
+});