Summary
Tag name: <f:facet>
Tag class: javax.faces.webapp.FacetTag
This tag adds its child as a facet of the nearest parent UIComponent.
A child consisting of multiple elements should be nested within a
container component (i.e., within an h:panelGroup for HTML library
components).
Unless otherwise specified, all attributes accept static values or EL expressions.
see Javadoc of JSF Specification