Tryit Editor v2.6

Edit This Code:
<!DOCTYPE html>
<html>
<head>
<script>
onerror = handleErr;
var txt = "";
function handleErr(msg, url, l) {
    txt = "There was an error on this page.\n\n";
    txt += "Error: " + msg + "\n";
    txt += "URL: " + url + "\n";
    txt += "Line: " + l + "\n\n";
    txt += "Click OK to continue.\n\n";
    alert(txt);
    return true;
}

function message() {
   adddlert("Welcome guest!");
}
</script>
</head>

<body>
<input type="button" value="View message" onclick="message()" />
</body>


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</html>