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<!DOCTYPE html> <html> <body> <p>Enter a number and click OK:</p> <input id="id1" type="number" min="100"> <button onclick="myFunction()">OK</button> <p>If the number is less than 100 (the input's min attribute), an error message will be displayed.</p> <p id="demo"></p> <script> function myFunction() { var txt = ""; if (document.getElementById("id1").validity.rangeUnderflow) { txt = "Value too small"; } else { txt = "Input OK"; } document.getElementById("demo").innerHTML = txt; } </script> </body> </html>