A WContainerWidget corresponds to an HTML
<div> or <span> element, and
groups other widgets.
One of the most fundamental building blocks of Wt, the widget
itself is usually invisible. The widgets that are contained
within the container widget can be layed out using CSS or one of
Wt's layout managers. CSS is usually the best option, but does
not work if you require vertical fitting or stretching of
children to the height of the container, or if you need to
layout children in a grid.
Wt also provides some specialized WContainerWidget classes that
have additional markup or behaviour:
Related topics: Style and Layout.