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function openFullscreen() { const container = document.querySelector("#unity-container"); if (container.requestFullscreen) { container.requestFullscreen(); } else if (container.webkitRequestFullscreen) { /* Safari */ container.webkitRequestFullscreen(); } else if (container.msRequestFullscreen) { /* IE11 */ container.msRequestFullscreen(); } } // Optional: Hide the button when already in fullscreen document.addEventListener('fullscreenchange', () => { const btn = document.getElementById('fullscreen-button'); if (document.fullscreenElement) { btn.style.visibility = 'hidden'; } else { btn.style.visibility = 'visible'; } });