You can use a hierarchy of heading levels to organize the contents of a document. There are six levels of headings that you can add to the style sheet. Heading 1, using the largest font, is the most important and Heading 6, using the smallest font, is the least important. Each level in the hierarchy can be assigned different formatting by modifying the font, font size, character styles, and spacing of the heading style.
Heading styles are based on font sizes relative to the document body style font size. The relative sizes are:
Relative font percentages are not uniform across browsers, and therefore, may be rendered differently. To overcome this problem, you can set a specific font size for headings, but they do not adjust in size if you change the document body font size. Note that if relative font sizing produces an unreadable size font for heading levels 5 and 6, you may want to specify a larger size for those levels or have the levels inherit their size from level 4.
The Web Page Editor automatically applies the attributes of the default heading style when a heading element of the same level is added to the web page. To apply a non-default heading style, you must add the heading element to the web page and then apply the style from the Styles list. See Use Styles in a Web Page in this chapter and Use the Format List in the Format a Paragraph section of the Enhance Content with Web Pages chapter for more information about using heading styles in a web page.