All HTML headings are available for use but the lower levels are discouraged generally.

Options

Create lighter, secondary text in any of the top 2 levels of heading with a generic <small> tag.

Understanding usage

Page or Article level

The <h1> element must only be used once per page. It is typically reserved for the page/article title and generally sits within a <header> element. You can read more about using headers within documents.

Section level

The <h2> element should be used for any form of important page-level heading, such as a section title. More than one may be used per page. Consider using this level of heading unless you need a level of less importance, such as within a sub-section.

Sub-section level

The <h3> element should be used for any form of page-level heading which falls within a sub-section of a document hierarchy.

Other levels

For anything that requires a subtle label or definition without dominating the main copy you can use the <h4> to <h6> elements. The NICE UI library purposefully discourages excessive levels of [visual] hierarchy by having identical styles for these three levels of heading.