Stopwatch

<html lang="en">
<head>
    <title>Stopwatch</title>
    
    <link rel="preconnect" href="https://fonts.gstatic.com">
    <link href="https://fonts.googleapis.com/css2?family=Poppins:wght@600&family=Roboto+Mono:wght@700&display=swap" rel="stylesheet">
    
    <style>
    
*,
*:before,
*:after{
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}
.container{
    background-color: #141313;
    width: 40%;
    min-width: 500px;
    position: absolute;
    transform: translate(-50%,-50%);
    top: 50%;
    left: 50%;
    padding: 60px 0;
    border-radius: 10px;
}
.timerDisplay{
    position: relative;
    width: 110%;
    background: linear-gradient(
        -135deg,
        #0048ce,
        #008bfd
    );
    left: -5%;
    padding: 40px 0;
    font-family: 'Roboto mono',monospace;
    color: #ffffff;
    font-size: 40px;
    display: flex;
    align-items: center;
    justify-content: space-around;
    border-radius: 5px;
    box-shadow: 0 0 20px rgba(0,139,253,0.25);
}
.buttons{
    width: 80%;
    margin: 60px auto 0 auto;
    display: flex;
    justify-content: space-around;
}
.buttons button{
    padding: 10px 20px;
    background-color: #ffffff;
    color: #141313;
    border: none;
    font-family: 'Poppins',sans-serif;
    font-size: 18px;
    border-radius: 5px;
    cursor: pointer;
    outline: none;
}    
    
    </style>
</head>
<body>
    <div class="container">
        <div class="timerDisplay">
            00 : 00 : 00 : 000
        </div>
        <div class="buttons">
            <button id="startTimer">Start</button>
            <button id="pauseTimer">Pause</button>
            <button id="resetTimer">Reset</button>
        </div>
    </div>
    
    <script>
    
let [milliseconds,seconds,minutes,hours] = [0,0,0,0];
let timerRef = document.querySelector('.timerDisplay');
let int = null;

document.getElementById('startTimer').addEventListener('click', ()=>{
    if(int!==null){
        clearInterval(int);
    }
    int = setInterval(displayTimer,10);
});

document.getElementById('pauseTimer').addEventListener('click', ()=>{
    clearInterval(int);
});

document.getElementById('resetTimer').addEventListener('click', ()=>{
    clearInterval(int);
    [milliseconds,seconds,minutes,hours] = [0,0,0,0];
    timerRef.innerHTML = '00 : 00 : 00 : 000 ';
});

timerRef.innerHTML = ` ${h} : ${m} : ${s} : ${ms}`;
}
    
    
    </script>
</body>
</html>

demo

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Stopwatch