1``block``
2=========
3
4Blocks are used for inheritance and act as placeholders and replacements at
5the same time. They are documented in detail in the documentation for the
6:doc:`extends<../tags/extends>` tag.
7
8Block names must consist of alphanumeric characters, and underscores. The first char can't be a digit and dashes are not permitted.
9
10.. seealso::
11
12    :doc:`block<../functions/block>`, :doc:`parent<../functions/parent>`, :doc:`use<../tags/use>`, :doc:`extends<../tags/extends>`
13