// Control timeline playback
tl.play(1.5); // Play from 1.5s
tl.play(-1); // Play 1s from end
tl.pause(); // Pause timeline
tl.resume(); // Continue playback
tl.seek(1.5); // Go to 1.5s or 'label'
tl.reverse(); // Reverse playback anytime
tl.timeScale(2); // Speed up timeline
tl.progress(0.5); // Skip to halfway