alert()

index.html

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>New Page</title>
</head>
<body>
<script>
var val=5;
window.onload=function() {
alert('Hello World!');
alert("Привет Мир!");
alert(val);
alert(val+10);
alert(val+' Hello World! '+10);
}
</script>
</body>
</html>

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>New Page</title>
</head>
<body>
<script>
var val=5;
window.onload=function() {
alert('Hello World!');
alert("Привет Мир!");
alert(val);
alert(val+10);
alert(val+' Hello World! '+10);
}
</script>
</body>
</html>