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let timerInterval; let timeLeft = 5400; // 90 minutes function startQuiz() { document.querySelector(".start-btn-container").style.display = "none"; document.getElementById("quizContainer").style.display = "block"; document.getElementById("timerBox").style.display = "block"; loadQuestions(); startTimer(); } function updateTimerDisplay(seconds) { const mins = String(Math.floor(seconds / 60)).padStart(2, '0'); const secs = String(seconds % 60).padStart(2, '0'); document.getElementById("timer").textContent = `${mins}:${secs}`; } function startTimer() { updateTimerDisplay(timeLeft); timerInterval = setInterval(() => { timeLeft--; updateTimerDisplay(timeLeft); if (timeLeft <= 0) { clearInterval(timerInterval); document.getElementById("quizForm").requestSubmit(); } }, 1000); }