HTML supports up to six different heading styles, with text identified as Heading 1
displayed in the most prominent style. You don't get to choose how those styles appear
of course--that's dependent on the platform and browser the document is viewed on.
But you can define the styles in your original document you want Terry Morse
Myrmidon to mark as Heading 1, Heading 2 and so forth on down to Heading 6. For
reference, here are the text sizes used by the Mac version of Netscape Navigator 3.0
when displaying headings:

Navigator 3.0 also displays all headings with a bold style. Browsers also tend to put
white space both above and below a heading. Typical spacing is 12 points both above
and below, but that can vary by size and browser.

By default, Terry Morse Myrmidon identifies a single line of text as a heading if it is
styled in bold and has 12 points of white space above and below it. This most closely
matches the way that Netscape Navigator 3.0 displays headings. If you are converting a
document whose headings don't match the default conversion settings, you can tell
Terry Morse Myrmidon how to tell them apart by selecting the matching check boxes
for Bold, Italic, Underline, Outline and Shadow in each of the Heading dialog boxes.
But if you do change the settings, the Web page will no longer look as "WYSIWYG"
(what you see is what you get).

Terry Morse Myrmidon strives to produce "what you see is what you get" conversions,
so it is particular about what text gets converted to a heading style. In order to be
converted to a heading, source text must have the specified minimum size and spacing,
and it must match the specified text style. In addition, only single lines of text will be
converted to a heading.