<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>onsubmit</title>
<style>
label, input {
font-size:20px;
}
</style>
</head>
<body>
<form action="examples/html/action.php"
        method="post" onsubmit="alert('Form
        data will be submitted to the server!'
        );">
<label>First Name:</label>
<input type="text" name="first-name"
            required>
<input type="submit" value="Submit">
</form>
</body>
</html>
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