diff --git a/doc/api/backend_webagg_core_api.rst b/doc/api/backend_webagg_core_api.rst
new file mode 100644
index 000000000000..0d1e58dd8f9f
--- /dev/null
+++ b/doc/api/backend_webagg_core_api.rst
@@ -0,0 +1,8 @@
+*******************************************
+``matplotlib.backends.backend_webagg_core``
+*******************************************
+
+.. automodule:: matplotlib.backends.backend_webagg_core
+   :members:
+   :undoc-members:
+   :show-inheritance:
diff --git a/doc/api/index_backend_api.rst b/doc/api/index_backend_api.rst
index 639d96a9a0dd..6012f71c52a4 100644
--- a/doc/api/index_backend_api.rst
+++ b/doc/api/index_backend_api.rst
@@ -20,5 +20,6 @@
    backend_qt_api.rst
    backend_svg_api.rst
    backend_tk_api.rst
+   backend_webagg_core_api.rst
    backend_webagg_api.rst
    backend_wx_api.rst
diff --git a/doc/api/prev_api_changes/api_changes_2.1.0.rst b/doc/api/prev_api_changes/api_changes_2.1.0.rst
index 39ea78bdf587..7d72d95783bb 100644
--- a/doc/api/prev_api_changes/api_changes_2.1.0.rst
+++ b/doc/api/prev_api_changes/api_changes_2.1.0.rst
@@ -296,7 +296,7 @@ Third-party backends should also migrate to the ``*_dashes`` methods.
 ``NavigationToolbar2.dynamic_update``
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-Use :meth:`.draw_idle` method on the ``Canvas`` instance instead.
+Use `~.FigureCanvasBase.draw_idle` method on the ``Canvas`` instance instead.
 
 
 Testing
diff --git a/lib/matplotlib/backend_bases.py b/lib/matplotlib/backend_bases.py
index 840082cc91ea..36c72af3c696 100644
--- a/lib/matplotlib/backend_bases.py
+++ b/lib/matplotlib/backend_bases.py
@@ -1116,10 +1116,10 @@ def __init__(self, interval=None, callbacks=None):
             The time between timer events in milliseconds.  Will be stored as
             ``timer.interval``.
         callbacks : list[tuple[callable, tuple, dict]]
-            List of (func, args, kwargs) tuples that will be called upon
-            timer events.  This list is accessible as ``timer.callbacks`` and
-            can be manipulated directly, or the functions `add_callback` and
-            `remove_callback` can be used.
+            List of (func, args, kwargs) tuples that will be called upon timer
+            events.  This list is accessible as ``timer.callbacks`` and can be
+            manipulated directly, or the functions `~.TimerBase.add_callback`
+            and `~.TimerBase.remove_callback` can be used.
         """
         self.callbacks = [] if callbacks is None else callbacks.copy()
         # Set .interval and not ._interval to go through the property setter.
diff --git a/lib/matplotlib/backends/backend_webagg.py b/lib/matplotlib/backends/backend_webagg.py
index 27c6a885a69f..14c0b525fb8f 100644
--- a/lib/matplotlib/backends/backend_webagg.py
+++ b/lib/matplotlib/backends/backend_webagg.py
@@ -1,6 +1,4 @@
-"""
-Displays Agg images in the browser, with interactivity
-"""
+"""Displays Agg images in the browser, with interactivity."""
 
 # The WebAgg backend is divided into two modules:
 #
diff --git a/lib/matplotlib/backends/backend_webagg_core.py b/lib/matplotlib/backends/backend_webagg_core.py
index 4c7a553f0d2d..4ceac1699543 100644
--- a/lib/matplotlib/backends/backend_webagg_core.py
+++ b/lib/matplotlib/backends/backend_webagg_core.py
@@ -1,6 +1,4 @@
-"""
-Displays Agg images in the browser, with interactivity
-"""
+"""Displays Agg images in the browser, with interactivity."""
 # The WebAgg backend is divided into two modules:
 #
 # - `backend_webagg_core.py` contains code necessary to embed a WebAgg