Heading classes can be added to text elements to give them the same visual appearance as base h1, h2, h3, etc., elements.

Styling for page headings 1-6 are provided to aid content structure.

View example of the default headings pattern

Heading classes are not tied to elements and can be freely mixed, for example you can apply p-heading--one style to an h3 element if that better suits your document style and tree.

View example of the mixed headings pattern