<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<button onclick = 'f=window.open("URL,exampe - google.com","fenetre","the style (without style tag, example - width=400, height=600, no px")'style="cursor: pointer;">pop up</button>
</body>
</html>