<h1 class="c-heading u-super">Super</h1>

<h1 class="c-heading u-xlarge">Extra Large</h1>

<h1 class="c-heading u-large">Large</h1>

<h1 class="c-heading u-medium">Medium</h1>

<h1 class="c-heading u-small">Small</h1>

<h1 class="c-heading u-xsmall">Extra Small</h1>

<h1 class="c-heading u-super">
  Sub-heading
  <div class="c-heading__sub">Hello, world</div>
</h1>