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\n`; downloadText('document.html', html, 'text/html'); } let isFullscreen = false; function toggleFullscreen() { isFullscreen = !isFullscreen; document.getElementById('mdLayout').classList.toggle('fullscreen', isFullscreen); document.getElementById('fullscreenBtn').textContent = isFullscreen ? '✕ Exit Fullscreen' : 'Fullscreen'; if (isFullscreen) document.body.style.overflow = 'hidden'; else document.body.style.overflow = ''; } // Initial render updatePreview(); updateStats();