<!DOCTYPE html>
<html>
<body>
<h1>Show checkboxes:</h1>
<form action="/action_page.php">
<input type="checkbox" name="vehicle1" value="Bike"> I have a bike<br>
<input type="checkbox" name="vehicle2" value="Car"> I have a car<br>
<input type="checkbox" name="vehicle3" value="Boat" checked> I have a boat<br><br>
</form>
</body>
</html>