<input id="inp" type="number" lang="ru-RU" step="0.1">
<div id='out'></div>
const inp = document.getElementById('inp');
const out = document.getElementById('out');
inp.addEventListener('input', (e) => {
  console.log(e.target.value);
  out.innerText = `value: ${e.target.value}`
})

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External JavaScript

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