Show or hide a portion of a template
<core:block hide> _contents_ </core:block>
The <core:block>tag is a ServerComponentTag that creates a BlockComponent.
The contents of the block tag are normally visible, but can be hidden using the show or hide methods on the BlockComponent.
If the hide attribute is used, the contents of the block will start out hidden.
Please have a look at the examples section to see this tag in action.