Cargar juego en iframe/nueva pestaña con opción de pantalla completa

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Cargar juego en iframe/nueva pestaña con opción de pantalla completa

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HTML

<!DOCTYPE html>
<html>
<head>
<base target="_blank">
<title>New Tab</title>
<style>
/* ---------------------------------------------------------------------- */
/* --- CSS (40% opacity and 1.5x smaller) --- */
/* ---------------------------------------------------------------------- */
#intro-text-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.9);    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999; 
}
.intro-message {
    color: gold;
    font-size: 5vw;
    font-family: 'Arial', sans-serif;
    font-weight: bold;
    text-shadow: 2px 2px 4px #000000;
    position: absolute;
    opacity: 0;
}
#intro-text-1 {
    animation: fade-and-hold-1 6s forwards;
}
#intro-text-2 {
    animation: fade-and-hold-2 6s forwards;
}@keyframes fade-and-hold-1 {
    0%, 5% { opacity: 0; }
    25% { opacity: 1; }
    45% { opacity: 1; }
    50%, 100% { opacity: 0; }
}
@keyframes fade-and-hold-2 {
    0%, 50% { opacity: 0; }
    55% { opacity: 1; }
    75% { opacity: 1; }
    95%, 100% { opacity: 0; }
}
.play-button {
    padding: 20px 40px;
    background: #000;
    color: #fff;
    border: 2px solid #4a148c;
    border-radius: 10px;
    font: bold 24px Arial;
    cursor: pointer;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 1001;
}
.play-button:hover {
    background: #4a148c;
}
.fullscreen-button {
    padding: 6.6px 10px;
    background: #000;    color: #fff;
    border: 2px solid #4a148c;
    border-radius: 5px;
    font: bold 9px Arial;
    cursor: pointer;
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 1002;
    opacity: 0.4; 
    transition: opacity 0.2s;
    outline: none; 
}
.fullscreen-button:hover {
    background: #4a148c;
    opacity: 1;
}
#fs-preview-btn {
    bottom: 60px; 
}

body, html {
    margin: 0;
    padding: 0;
    overflow: hidden;
    height: 100%;
    background: #000;
}
#container {
    width: 100%;
    height: 100%;
}
/* ---------------------------------------------------------------------- */</style>
</head>
<body>
<div id="intro-text-overlay">
    <span id="intro-text-1" class="intro-message">MC</span>
    <span id="intro-text-2" class="intro-message">enjoy</span>
</div>
<div id="container">
    <iframe id="fr" width="100%" height="100%" frameborder="0" allowfullscreen="" style="display:none;"></iframe>
    <button class="play-button" type="button" onclick="PlayTo(this)">PLAY REGULAR</button>
    <p id="unblocked-text" style="color:white; position:absolute; top:60%; left:50%; transform:translateX(-50%);">G+ (MC 1.20) contact zzzjz510@gmail.com for game suggestions/fixes. (you can use your school gmail i will see them)</p>
    
    <button id="fs-preview-btn" class="fullscreen-button" type="button" onclick="toggleBrowserFullscreen(); this.blur();">TOGGLE FULLSCREEN</button>
    
    <button id="fs-btn" class="fullscreen-button" type="button" onclick="openFullscreen(); this.blur();">OPEN UNDETECTABLE</button>
</div><script>
    const ENCODED_URL = 'aHR0cHM6Ly9ydXNlbGxvMjUuZ2l0aHViLmlvL0VhZ2x5TUMtMS4yMC8='; 
    const DB_NAME = 'GameCacheDB';
    const STORE_NAME = 'GameFiles';
    const CACHE_DURATION = 90 * 24 * 60 * 60 * 1000;

async function saveToCache(url, content) {
        const db = await openDB();
        const transaction = db.transaction(STORE_NAME, 'readwrite');        transaction.objectStore(STORE_NAME).put({ url: url, content: content, timestamp: Date.now() });
    }

async function getFileFromCache(url) {
        const db = await openDB();
        return new Promise((resolve, reject) => {
            const transaction = db.transaction(STORE_NAME, 'readonly');
            const request = transaction.objectStore(STORE_NAME).get(url);
            request.onsuccess = async (event) => {
                const data = event.target.result;
                if (data && (Date.now() - data.timestamp) < CACHE_DURATION) {
                    resolve(data.content);
                } else {
                    try {
                        const response = await fetch(url);
                        const text = await response.text();
                        await saveToCache(url, text);
                        resolve(text);
                    } catch (err) { reject(err); }
                }            };
        });
    }

// Refocus the game iframe so keys work
    function refocusGame() {
        const iframe = document.getElementById("fr");
        if (iframe && iframe.style.display !== "none") {
            iframe.focus();
        }
    }

function PlayTo(button) {
        const fileUrl = getFileUrl();
        const iframe = document.getElementById("fr");
        const fsBtn = document.getElementById("fs-btn");
        const previewBtn = document.getElementById("fs-preview-btn");

getFileFromCache(fileUrl).then((text) => {
            iframe.contentDocument.open();
            iframe.contentDocument.write(text);
            iframe.contentDocument.close();            
            iframe.style.display = "block";
            button.style.display = "none";
            document.getElementById("unblocked-text").style.display = "none";
            
            if(previewBtn) previewBtn.style.display = "none";

// Focus the game immediately after it loads
            setTimeout(refocusGame, 500);

fsBtn.innerHTML = "TOGGLE FULLSCREEN";
            fsBtn.onclick = function() {
                toggleBrowserFullscreen();
                this.blur();
            };
            
        }).catch((err) => {
            alert('Could not load game content.');
        });
    }

CSS