Untitled

<!DOCTYPE html>
<html>
<head>

<!-- metadata goes in head -->

    <title>Colors!!</title>


</head>
<body>
<!-- content goes in the body -->
    <h1>Zmieniamy kolor tła co 2 sekundy!!</h1>

    <input id="button" type="submit" name="button" value="Biały" style="width: 5%" onclick="myFunction()"/>

    <script
    language="javascript" type="text/javascript">
    //vars

    //alert("Zmiana koloru tła, zadanie 3.");
    document.body.style.backgroundColor = "red";

    function myFunction() {
        document.getElementById("button").click();
        setInterval(function(){ document.body.style.backgroundColor = "blue"; }, 2000);
        setInterval(function(){ document.body.style.backgroundColor = "yellow"; }, 4000);
    }

     </script>
</body>
</html>