Web Captioning or Internet captioning is text that follows the images or animation.  It can also be used for HTML, Google media and Quick Time presentations on CD or DVD.

One popular way to do it is with "Synchronized Multimedia Integration Language (SMIL) files.  Timed Text (TT) files are a SMIL subset that describes a way to animate text.  It all comes together in the Timing and Synchronization module of SMIL 2.0. 

Files that follow this standard form the basis for captioning Internet video on both MAC and PC platforms.

Google® takes another approach to caption its media.  They use a special SUM file format to caption Google media, but it too is derived from the timed text model.

Webmasters use Timed Text files as part of complicated pages -- like this one.  TT caption files are actually simple HTML files but they contain lots of tedious timing information.

AutoCaption will generate Timed Text files.  AutoCaption will also make Google media SUM files or SMIL files.  All at a click of a button.  No new techniques or software packages to learn.

You work the same way you do for closed captioning or subtitling.  The only difference is the output format you select -- AutoCaption does the rest.

Firefox (Mozilla) users: SMIL and TT support is part of the SVG project.  Alas the SVG project is still in progress (click here for details) so as of this writing you will see just a list of captions without any video on the left.