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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>TIMER</title>
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<style>
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body {
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display:flex; align-items:center; justify-content:center;
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min-height:100vh; margin:0;
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font-size:6em; font-family:monospace;
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}
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input {
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padding:0; border:0; outline:none; background:none;
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font-size:inherit; font-family:monospace;
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}
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</style>
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</head>
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<body>
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<div>
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T − <input type="text" id="time" size="8" placeholder="hh:mm:ss">
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</div>
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<script>
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((t = document.querySelector("#time"), on = false, tmr = undefined) =>
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t.addEventListener(
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"keyup",
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(e, s = t.value.split(':').reduce((a, x) => (60 * a) + +x)) => e.keyCode == 13 && !on
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? (
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on = true,
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t.blur(),
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tmr = setInterval(() => s == 0
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? (on = false, clearInterval(tmr), t.value = "")
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: t.value = (new Date(s-- * 1000)).toISOString().substr(11, 8).replace(/:/g, ':'), 1000)
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)
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: 0
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)
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)()
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</script>
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</body>
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</html>
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