This tag acts as a placeholder for your dynamic Apex components. It has one required
parameter—component Value—which accepts the name of an Apex method that returns a
dynamic component.
The following Visualforce components do not have dynamic Apex representations:

<apex:actionRegion>
<apex:attribute>
<apex:component>
<apex:componentBody>
<apex:composition>
<apex:define>
<apex:dynamicComponent>
<apex:flash>
<apex:inputFile>
<apex:include>
<apex:insert>
<apex:pageMessage>
<apex:pageMessages>
<apex:variable>
<apex:vote>
Any non-<apex:> tag, like <chatter:>, <flow:>, <ideas:>, <knowledge:>, <messaging:>, or <site:>

A template component that declares a named area that must be defined by an <apex:define>
component in another Visualforce page. Use this component with the <apex:composition> and
<apex:define> components to share data between multiple pages.

Defines tooltips which appear on mouseover of data series elements. This component offers more
configuration options than the default tooltips displayed by setting the tips attribute of a data series
component to true.
Note: This component must be enclosed by a data series component (<apex:barSeries>,
<apex:lineSeries>, or <apex:pieSeries>).

A message for a specific component, such as a warning or error. If an <apex:message> or
<apex:messages> component is not included in a page, most warning and error messages are
only shown in the debug log.

A component that provides support for invoking controller action methods directly from JavaScript
code using an AJAX request. An <apex:actionFunction> component must be a child of an
<apex:form> component.