<html>
<head>
<script src="/brython.js"></script>
</head>
<body onload="brython()">
<script type="text/python">
from browser import document
from browser.widgets.dialog import InfoDialog
def click(ev):
InfoDialog("Hello", f"Hello, {document['zone'].value} !")
# bind event 'click' on button to function echo
document["echo"].bind("click", click)
</script>
<input id="zone">
<button id="echo">click !</button>
</body>
</html>