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HTML

<!DOCTYPE html>
<html lang="tr">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Kronometre</title>
    <style>
        body {
            font-family: Arial, Helvetica, sans-serif;
            text-align: center;
            margin-top: 50px;
        }
        #display {
            font-size: 10em;
            margin: 20px;
            font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
        }
        button {
            font-size: 5em;
            margin: 5px;
            color: blueviolet;
            background-color: yellowgreen;
            border-radius: 8px;
            cursor: pointer;
            transition: background-color 0.45 s;
        }
        button :hover{
            background-color: rgb(55, 16, 161);
        }
    </style>
</head>
<body>
    <h1>Basit Kronometre</h1>
    <div id="display">00:00:00</div>
    <button onclick="startTimer()">Başlat</button>
    <button onclick="stopTimer()">Durdur</button>
    <button onclick="resetTimer()">Sıfırla</button>

function startTimer() {
            if (!running) {
                running = true;
                timer = setInterval(updateDisplay, 1000);
            }
        }

function stopTimer() {
            running = false;
            clearInterval(timer);
        }

function resetTimer() {
            running = false;
            clearInterval(timer);
            seconds = 0;
            minutes = 0;
            hours = 0;
            document.getElementById("display").innerText = "00:00:00";
        }

CSS