HTML heading_elements element

The <h1> to <h6> HTML elements represent six levels of section headings. <h1> is the highest section level and <h6> is the lowest. By default, all heading elements create a block-level box in the layout, starting on a new line and taking up the full width available in their containing block.

Heading information can be used by user agents to construct a table of contents for a document automatically. Do not use heading elements to resize text. Instead, use the CSS font-size property. Do not skip heading levels: always start from <h1>, followed by <h2> and so on.

Attributes: The headingoffset and headingreset global attributes can be used to adjust the computed heading level of these elements.