M3L5.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <p>enter a number and click oke </p>
    <input id="id1" type="number" min="100">
    <button type="button" onclick="myFunction()">oke</button>
    <p>if the number is less tan 100 (the input mins atribut), an error message wil 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 oke"
        }
        document.getElementById("demo").innerHTML = txt ;
    }
    </script>
</body>
</html>