Zad1

<!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>
    <script>
        function powitanie() {
            var tekst = document.getElementById("tekst").value;
            if (tekst == "") {
                document.getElementById("pole").innerHTML = ""
                document.getElementById("pole2").innerHTML = "Brak wprowadzonego tekstu";
            } else {
                document.getElementById("pole2").innerHTML = ""
                document.getElementById("pole").innerHTML = "Cześć " + tekst;
            }

        }
    </script>
    <style>
        #pole2 {
            color: red;
        }
    </style>
</head>

<body>
    <form>
        <input type="text" id="tekst"><br>
        <input type="button" value="powitaj" onclick="powitanie()">
    </form>
    <p id="pole"></p>
    <p id="pole2"></p>


</body>

</html>