This tag allows a custom component author to define a location where a user can insert content into the custom component.
This is especially useful for generating custom iteration components.
This component is valid only within an <apex:component> tag, and only a single definition per custom component is allowed.
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The tag that allows a custom component author to define a location where a user can insert content into the custom component is the apex:facet tag.
The apex:facet tag is used to define a named area within a custom component where other components or content can be dynamically added. This allows the custom component to be more flexible and customizable, as users can add their own content to the component.
The apex:facet tag is especially useful for generating custom iteration components, as it allows users to add their own data to the component without requiring changes to the component code.
The apex:facet tag is only valid within an apex:component tag, and only a single definition per custom component is allowed. This means that if multiple facets are needed within a custom component, they must be named differently.
In summary, the apex:facet tag is a powerful tool for custom component authors, allowing them to create more flexible and customizable components that can be easily extended by end-users.