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<html><body><h1>JavaScript Numbers</h1><h2>Integer Precision</h2><p>Integers (numbers without a period or exponent notation) are accurate up to 15 digits:</p><p id="demo"></p><script>let x = 999999999999999;let y = 9999999999999999;document.getElementById("demo").innerHTML = x + "<br>" + y;</script></body></html>