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HTML provides 6 levels of headings: H1,
H2, H3, H4, H5, and H6. These should be used to mark headings
according to their relative importance, with H1 being the most
important. Headings are block elements, and can only be created as children of
elements that have block-type content. Note that for tables of data there are
special elements to mark headings.
The first three levels of heading can be created from the toolbar using the
heading Icons 
, 
, 
. All levels of heading can be created from the Types menu, or
using keyboard shortcuts. The default keyboard shortcuts are
control-1 for H1, control-2 for
H2, and so on to control-6 for H6.
There are default styles for headings in most browsers to give some idea of their relative importance, but the author can also use style sheets to provide a suggested presentation.