<h3 class="">This is a header h3</h3>
<{{ element }} {{ attr }} class="{{ class }}">{{ text }}</{{ element }}>
{
  "element": "h3",
  "text": "This is a header h3"
}

In additon to default styling on <h1> to <h6>, classes are available to inherit visual style.

The classes .h1 to .h6 can be applied to any header element.