StaticReadundefined when the template has no content row
StaticSelectThe row a template renders: lowest Priority; ties are broken by the oldest row, then the lowest normalised ID, so
every reader of this helper picks the same row — the template engine itself breaks ties by load order, so two
content rows with equal Priority are not supported.
The row the template renders now, read through
provider(bypassing caches, so a row saved moments ago is seen).