diff --git a/Doc/library/html.parser.rst b/Doc/library/html.parser.rst
index 341a8337ba2ceb..11f851d4f6c4b7 100644
--- a/Doc/library/html.parser.rst
+++ b/Doc/library/html.parser.rst
@@ -141,7 +141,7 @@ implementations do nothing (except for :meth:`~HTMLParser.handle_startendtag`):
    argument is a list of ``(name, value)`` pairs containing the attributes found
    inside the tag's ``<>`` brackets.  The *name* will be translated to lower case,
    and quotes in the *value* have been removed, and character and entity references
-   have been replaced.
+   have been replaced.  For empty attributes, *value* is ``None``.
 
    For instance, for the tag ``<A HREF="https://www.cwi.nl/">``, this method
    would be called as ``handle_starttag('a', [('href', 'https://www.cwi.nl/')])``.
@@ -317,6 +317,18 @@ without further parsing:
    Data     : alert("<strong>hello! &#9786;</strong>");
    End tag  : script
 
+Attribute names are converted to lowercase, quotes from attribute values removed,
+and ``None`` is returned as *value* for empty attributes (such as ``checked``):
+
+.. doctest::
+
+   >>> parser.feed("<input TYPE='checkbox' checked required='' disabled=disabled>")
+   Start tag: input
+        attr: ('type', 'checkbox')
+        attr: ('checked', None)
+        attr: ('required', '')
+        attr: ('disabled', 'disabled')
+
 Parsing comments:
 
 .. doctest::
diff --git a/Lib/test/test_cmath.py b/Lib/test/test_cmath.py
index 389a3fa0e0a1eb..a986fd6b892bd2 100644
--- a/Lib/test/test_cmath.py
+++ b/Lib/test/test_cmath.py
@@ -516,6 +516,7 @@ def test_isinf(self):
         self.assertFalse(cmath.isinf(1j))
         self.assertFalse(cmath.isinf(NAN))
         self.assertTrue(cmath.isinf(INF))
+        self.assertTrue(cmath.isinf(-INF))
         self.assertTrue(cmath.isinf(complex(INF, 0)))
         self.assertTrue(cmath.isinf(complex(0, INF)))
         self.assertTrue(cmath.isinf(complex(INF, INF)))
diff --git a/Python/ceval.c b/Python/ceval.c
index 506ea591c385c0..0d7f8a62e246ae 100644
--- a/Python/ceval.c
+++ b/Python/ceval.c
@@ -3409,7 +3409,7 @@ _PyEval_FormatKwargsError(PyThreadState *tstate, PyObject *func, PyObject *kwarg
         _PyErr_Format(
             tstate, PyExc_TypeError,
             "%V got multiple values for keyword argument '%S'",
-            funcstr, "finction", dupkey);
+            funcstr, "function", dupkey);
         Py_XDECREF(funcstr);
         return;
     }