role
List items can be turned into dividers to organize and group the list items. This is done by setting the role property to "List divider". A list divider is styled with the bar swatch "a" by default (light grey in the default theme) but you can specify a theme for dividers by setting the dividerSwatch property in the parent HTML List weblet.
Default value
[None]
Valid Values
[None] and List divider.