<!DOCTYPE html>
   <htmllang="en">
   <head>
   <meta charset="UTF-8">
   <meta http-equiv="X-UA-Compatible" content="IE=edge">
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <title> IF/ELSE </title>  
   </head>
   <body>
   <script>
 if ( jeżeli prąd ){
 return: instruction one
} else {
 return: instruction one
 }
</script>
</body>
</html>