gtk-doc is used to document the API of the GTK+ and GNOME libraries.

Enhancements
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o Use the new style.css stylesheet instead of hard-wiring the styles.
o Updated the documentation and example build files.
o Added support for a gallery of widget images.
o Output default values for widget properties and allowed ranges.
o Only underline links in the docs when the mouse hovers over them.
o Added support for placing the parameter table anywhere within the function documentation (using the "PARAMETERS" marker).
o Handle more variations of C syntax.