We use headings to break up the text and add anchor links at the top of the page.
Each page should contain a single <h1> tag. Don't use multiple <h1> tags on a page as this will have a negative affect on the SEO page ranking.
This <h2> style should be used as the sub header on a page to break it into sections.
This <h2> header is be used for the ‘on this page’ subtitle that features on most content pages.
This style of <h3> header is designed for breaking section of a page down into subsections.
This <h3> style is reserved for section headers in the contextual menu column.
The site summary and site collection pages feature lists of subpages with summary information included underneath. The <h2> style should be used in these cases.
This <h3> navigation is used on the grey background menu areas such as the right hand column on the homepage.
The <h3> navigation is used on a white background, as seen on the website homepage.