<!DOCTYPE html>
<html lang="pl">
<meta charset="UTF-8">
<title>Page Title</title>
<meta name="viewport" content="width=device-width,initial-scale=1">
<script>
function operatingSytem() {
var OSName="Unknown OS";
if (navigator.appVersion.indexOf("Win")!=-1) OSName="Windows";
if (navigator.appVersion.indexOf("Mac")!=-1) OSName="MacOS";
if (navigator.appVersion.indexOf("X11")!=-1) OSName="UNIX";
if (navigator.appVersion.indexOf("Linux")!=-1) OSName="Linux";
document.getElementById("OS").innerHTML = OSName;
}
</script>
<body>
<button onclick="operatingSytem()">
Pokaż system operacyjny
</button>
<p id="OS"></p>
</body>
</html>
