Use Headings in Order

Headings (such as H3, H4, etc) need to be put in your XHTML text in proper sequential order. As you will notice, the XHTML editor does not allow you to select H1 and H2 headings, as those are used in the structure already.

Basically, to use headings correctly, don't jump around. For example this would be incorrect:

H3 Heading Style

Content goes here.

H5 Heading Style

More content goes here.

H4 Heading Style

And even more content here.

In that example, the H5 (Heading 5) comes before the H4 (Heading 4) tag so that would be incorrect. Headings need to always be in the proper order. As mentioned earlier, the Heading 1 and Heading 2 are used by the system already so your first heading within your content should be Heading 3.