This element is the default implementation of the flush parser, which flushes all cached nodes from the point it is located within the node tree.
Flush can serve as a utility tag when, for unknown reasons, adding or removing markup has seemingly no effect on the target WordPress context.
When used, restored cache nodes will ignored while a delete action will be applied to the remaining cached nodes. This means the proceeding nodes will be re-inserted into the target WordPress context.
parser : 'flush'
The first page element will not be re-inserted while it remains unmodified, and all posts after <flush> will always be deleted and re-created within the current WordPress target.
<page 'Page One' />
<flush />
<page 'Page Two' />
<page 'Page Three' />