Allows part of a post title to be styled as a subtitle. It is still within the title heading, but is wrapped in a span to be styled differently.
The back-end interface, showing the Visual Subtitle field.
Showing the visual subtitle on the front-end, in this case, styled red, smaller, italic and bold.
The front-end markup, showing the span inside the existing heading element (may differ for your own theme).
Showing the subtitle in the Posts list - the second entry has no subtitle.
The subtitle can also be amended from the quick edit feature.