Simple example of usage Heading element.

use function Thermage\heading;
use function Thermage\render;

// ...

render (
  heading('Stay RAD!')->size1().
  heading('Stay RAD!')->size2().
  heading('Stay RAD!')->size3().
  heading('Stay RAD!')->size4().
  heading('Stay RAD!')->size5()
);
Terminal
$ php thermage.php
Stay RAD!

Stay RAD!

Stay RAD!

Stay RAD!

Stay RAD!