Add a class option to the autosummary directive

CHANGES.rst

@@ -24,6 +24,8 @@ Features added
 * #11824: linkcode: Allow extensions to add support for a domain by defining
   the keys that should be present.
   Patch by Nicolas Peugnet.
+* #13144: Add a ``class`` option to the :rst:dir:`autosummary` directive.
+  Patch by Tim Hoffmann.
 
 Bugs fixed
 ----------

doc/usage/extensions/autosummary.rst

@@ -63,6 +63,16 @@ The :mod:`sphinx.ext.autosummary` extension does this in two parts:
 
    .. rubric:: Options
 
+   .. rst:directive:option:: class: class names
+      :type: a list of class names, separated by spaces
+
+      Assign `class attributes`_ to the table.
+      This is a :dudir:`common option <common-options>`.
+
+      .. _class attributes: https://docutils.sourceforge.io/docs/ref/doctree.html#classes
+
+      .. versionadded:: 8.2
+
    .. rst:directive:option:: toctree: optional directory name
 
       If you want the :rst:dir:`autosummary` table to also serve as a

sphinx/ext/autosummary/__init__.py

@@ -234,6 +234,7 @@ class Autosummary(SphinxDirective):
     has_content = True
     option_spec: ClassVar[OptionSpec] = {
         'caption': directives.unchanged_required,
+        'class': directives.class_option,
         'toctree': directives.unchanged,
         'nosignatures': directives.flag,
         'recursive': directives.flag,
@@ -431,7 +432,9 @@ def get_table(self, items: list[tuple[str, str, str, str]]) -> list[Node]:
         table_spec['spec'] = r'\X{1}{2}\X{1}{2}'
 
         table = autosummary_table('')
-        real_table = nodes.table('', classes=['autosummary longtable'])
+        real_table = nodes.table(
+            '', classes=['autosummary', 'longtable', *self.options.get('class', ())]
+        )
         table.append(real_table)
         group = nodes.tgroup('', cols=2)
         real_table.append(group)