diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index f90d4aeb7..89dc8fde9 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -42,12 +42,10 @@ jobs:
       with:
         python-version: ${{ matrix.python }}
     - name: Set up Python ${{ matrix.python }} (deadsnakes)
-      uses: deadsnakes/action@v1.0.0
+      uses: deadsnakes/action@v2.0.1
       if: endsWith(matrix.python, '-dev')
       with:
         python-version: ${{ matrix.python }}
-      env:
-        ACTIONS_ALLOW_UNSECURE_COMMANDS: true
     - name: Check Python version
       run: python --version
     - name: Install graphviz
diff --git a/CHANGES b/CHANGES
index 59f2b0aff..5ad0d36a5 100644
--- a/CHANGES
+++ b/CHANGES
@@ -14,6 +14,7 @@ Deprecated
 ----------
 
 * The ``follow_wrapped`` argument of ``sphinx.util.inspect.signature()``
+* ``sphinx.ext.autodoc.DataDeclarationDocumenter``
 * ``sphinx.util.requests.is_ssl_error()``
 
 Features added
@@ -42,6 +43,12 @@ Bugs fixed
   is decorated
 * #8434: autodoc: :confval:`autodoc_type_aliases` does not effect to variables
   and attributes
+* #8443: autodoc: autodata directive can't create document for PEP-526 based
+  type annotated variables
+* #8443: autodoc: autoattribute directive can't create document for PEP-526
+  based uninitalized variables
+* #8419: html search: Do not load ``language_data.js`` in non-search pages
+* #8454: graphviz: The layout option for graph and digraph directives don't work
 * #8437: Makefile: ``make clean`` with empty BUILDDIR is dangerous
 
 Testing
diff --git a/doc/extdev/deprecated.rst b/doc/extdev/deprecated.rst
index 392325246..31de41a10 100644
--- a/doc/extdev/deprecated.rst
+++ b/doc/extdev/deprecated.rst
@@ -31,6 +31,11 @@ The following is a list of deprecated interfaces.
      - 5.0
      - N/A
 
+   * - ``sphinx.ext.autodoc.DataDeclarationDocumenter``
+     - 3.4
+     - 5.0
+     - ``sphinx.ext.autodoc.DataDocumenter``
+
    * - ``sphinx.util.requests.is_ssl_error()``
      - 3.4
      - 5.0
diff --git a/sphinx/builders/html/__init__.py b/sphinx/builders/html/__init__.py
index d7986e7dc..6d263a9ed 100644
--- a/sphinx/builders/html/__init__.py
+++ b/sphinx/builders/html/__init__.py
@@ -301,7 +301,6 @@ class StandaloneHTMLBuilder(Builder):
         self.add_js_file('jquery.js')
         self.add_js_file('underscore.js')
         self.add_js_file('doctools.js')
-        self.add_js_file('language_data.js')
 
         for filename, attrs in self.app.registry.js_files:
             self.add_js_file(filename, **attrs)
diff --git a/sphinx/ext/autodoc/__init__.py b/sphinx/ext/autodoc/__init__.py
index 1bd49fc38..243d13572 100644
--- a/sphinx/ext/autodoc/__init__.py
+++ b/sphinx/ext/autodoc/__init__.py
@@ -961,7 +961,7 @@ class ModuleDocumenter(Documenter):
     def __init__(self, *args: Any) -> None:
         super().__init__(*args)
         merge_members_option(self.options)
-        self.__all__ = None
+        self.__all__ = None  # type: Optional[Sequence[str]]
 
     @classmethod
     def can_document_member(cls, member: Any, membername: str, isattr: bool, parent: Any
@@ -985,26 +985,16 @@ class ModuleDocumenter(Documenter):
         return ret
 
     def import_object(self, raiseerror: bool = False) -> bool:
-        def is_valid_module_all(__all__: Any) -> bool:
-            """Check the given *__all__* is valid for a module."""
-            if (isinstance(__all__, (list, tuple)) and
-                    all(isinstance(e, str) for e in __all__)):
-                return True
-            else:
-                return False
-
         ret = super().import_object(raiseerror)
 
-        if not self.options.ignore_module_all:
-            __all__ = getattr(self.object, '__all__', None)
-            if is_valid_module_all(__all__):
-                # valid __all__ found. copy it to self.__all__
-                self.__all__ = __all__
-            elif __all__:
-                # invalid __all__ found.
-                logger.warning(__('__all__ should be a list of strings, not %r '
-                                  '(in module %s) -- ignoring __all__') %
-                               (__all__, self.fullname), type='autodoc')
+        try:
+            if not self.options.ignore_module_all:
+                self.__all__ = inspect.getall(self.object)
+        except ValueError as exc:
+            # invalid __all__ found.
+            logger.warning(__('__all__ should be a list of strings, not %r '
+                              '(in module %s) -- ignoring __all__') %
+                           (exc.args[0], self.fullname), type='autodoc')
 
         return ret
 
@@ -1697,6 +1687,28 @@ class DataDocumenter(ModuleLevelDocumenter):
                             ) -> bool:
         return isinstance(parent, ModuleDocumenter) and isattr
 
+    def import_object(self, raiseerror: bool = False) -> bool:
+        try:
+            return super().import_object(raiseerror=True)
+        except ImportError as exc:
+            # annotation only instance variable (PEP-526)
+            try:
+                self.parent = importlib.import_module(self.modname)
+                annotations = get_type_hints(self.parent, None,
+                                             self.config.autodoc_type_aliases)
+                if self.objpath[-1] in annotations:
+                    self.object = UNINITIALIZED_ATTR
+                    return True
+            except ImportError:
+                pass
+
+            if raiseerror:
+                raise
+            else:
+                logger.warning(exc.args[0], type='autodoc', subtype='import_object')
+                self.env.note_reread()
+                return False
+
     def add_directive_header(self, sig: str) -> None:
         super().add_directive_header(sig)
         sourcename = self.get_sourcename()
@@ -1733,6 +1745,13 @@ class DataDocumenter(ModuleLevelDocumenter):
         return self.get_attr(self.parent or self.object, '__module__', None) \
             or self.modname
 
+    def add_content(self, more_content: Any, no_docstring: bool = False) -> None:
+        if self.object is UNINITIALIZED_ATTR:
+            # suppress docstring of the value
+            super().add_content(more_content, no_docstring=True)
+        else:
+            super().add_content(more_content, no_docstring=no_docstring)
+
 
 class DataDeclarationDocumenter(DataDocumenter):
     """
@@ -1746,30 +1765,10 @@ class DataDeclarationDocumenter(DataDocumenter):
     # must be higher than AttributeDocumenter
     priority = 11
 
-    @classmethod
-    def can_document_member(cls, member: Any, membername: str, isattr: bool, parent: Any
-                            ) -> bool:
-        """This documents only INSTANCEATTR members."""
-        return (isinstance(parent, ModuleDocumenter) and
-                isattr and
-                member is INSTANCEATTR)
-
-    def import_object(self, raiseerror: bool = False) -> bool:
-        """Never import anything."""
-        # disguise as a data
-        self.objtype = 'data'
-        self.object = UNINITIALIZED_ATTR
-        try:
-            # import module to obtain type annotation
-            self.parent = importlib.import_module(self.modname)
-        except ImportError:
-            pass
-
-        return True
-
-    def add_content(self, more_content: Any, no_docstring: bool = False) -> None:
-        """Never try to get a docstring from the object."""
-        super().add_content(more_content, no_docstring=True)
+    def __init__(self, *args: Any, **kwargs: Any) -> None:
+        warnings.warn("%s is deprecated." % self.__class__.__name__,
+                      RemovedInSphinx50Warning, stacklevel=2)
+        super().__init__(*args, **kwargs)
 
 
 class GenericAliasDocumenter(DataDocumenter):
@@ -2036,6 +2035,22 @@ class AttributeDocumenter(DocstringStripSignatureMixin, ClassLevelDocumenter):
 
     def isinstanceattribute(self) -> bool:
         """Check the subject is an instance attribute."""
+        # uninitialized instance variable (PEP-526)
+        with mock(self.config.autodoc_mock_imports):
+            try:
+                ret = import_object(self.modname, self.objpath[:-1], 'class',
+                                    attrgetter=self.get_attr,
+                                    warningiserror=self.config.autodoc_warningiserror)
+                self.parent = ret[3]
+                annotations = get_type_hints(self.parent, None,
+                                             self.config.autodoc_type_aliases)
+                if self.objpath[-1] in annotations:
+                    self.object = UNINITIALIZED_ATTR
+                    return True
+            except ImportError:
+                pass
+
+        # An instance variable defined inside __init__().
         try:
             analyzer = ModuleAnalyzer.for_module(self.modname)
             attr_docs = analyzer.find_attr_docs()
@@ -2046,7 +2061,9 @@ class AttributeDocumenter(DocstringStripSignatureMixin, ClassLevelDocumenter):
 
             return False
         except PycodeError:
-            return False
+            pass
+
+        return False
 
     def import_object(self, raiseerror: bool = False) -> bool:
         try:
@@ -2282,7 +2299,6 @@ def setup(app: Sphinx) -> Dict[str, Any]:
     app.add_autodocumenter(ClassDocumenter)
     app.add_autodocumenter(ExceptionDocumenter)
     app.add_autodocumenter(DataDocumenter)
-    app.add_autodocumenter(DataDeclarationDocumenter)
     app.add_autodocumenter(GenericAliasDocumenter)
     app.add_autodocumenter(TypeVarDocumenter)
     app.add_autodocumenter(FunctionDocumenter)
diff --git a/sphinx/ext/autosummary/generate.py b/sphinx/ext/autosummary/generate.py
index 7e187e36a..f6a84b4e4 100644
--- a/sphinx/ext/autosummary/generate.py
+++ b/sphinx/ext/autosummary/generate.py
@@ -85,8 +85,7 @@ AutosummaryEntry = NamedTuple('AutosummaryEntry', [('name', str),
 
 
 def setup_documenters(app: Any) -> None:
-    from sphinx.ext.autodoc import (AttributeDocumenter, ClassDocumenter,
-                                    DataDeclarationDocumenter, DataDocumenter,
+    from sphinx.ext.autodoc import (AttributeDocumenter, ClassDocumenter, DataDocumenter,
                                     DecoratorDocumenter, ExceptionDocumenter,
                                     FunctionDocumenter, GenericAliasDocumenter,
                                     InstanceAttributeDocumenter, MethodDocumenter,
@@ -96,8 +95,7 @@ def setup_documenters(app: Any) -> None:
         ModuleDocumenter, ClassDocumenter, ExceptionDocumenter, DataDocumenter,
         FunctionDocumenter, MethodDocumenter, AttributeDocumenter,
         InstanceAttributeDocumenter, DecoratorDocumenter, PropertyDocumenter,
-        SlotsAttributeDocumenter, DataDeclarationDocumenter, GenericAliasDocumenter,
-        SingledispatchFunctionDocumenter,
+        SlotsAttributeDocumenter, GenericAliasDocumenter, SingledispatchFunctionDocumenter,
     ]  # type: List[Type[Documenter]]
     for documenter in documenters:
         app.registry.add_documenter(documenter.objtype, documenter)
diff --git a/sphinx/ext/graphviz.py b/sphinx/ext/graphviz.py
index 62375f95b..dc1cbb686 100644
--- a/sphinx/ext/graphviz.py
+++ b/sphinx/ext/graphviz.py
@@ -182,7 +182,8 @@ class GraphvizSimple(SphinxDirective):
         'alt': directives.unchanged,
         'align': align_spec,
         'caption': directives.unchanged,
-        'graphviz_dot': directives.unchanged,
+        'layout': directives.unchanged,
+        'graphviz_dot': directives.unchanged,  # an old alias of `layout` option
         'name': directives.unchanged,
         'class': directives.class_option,
     }
@@ -194,6 +195,8 @@ class GraphvizSimple(SphinxDirective):
         node['options'] = {'docname': self.env.docname}
         if 'graphviz_dot' in self.options:
             node['options']['graphviz_dot'] = self.options['graphviz_dot']
+        if 'layout' in self.options:
+            node['options']['graphviz_dot'] = self.options['layout']
         if 'alt' in self.options:
             node['alt'] = self.options['alt']
         if 'align' in self.options:
diff --git a/sphinx/themes/basic/search.html b/sphinx/themes/basic/search.html
index 2673369f2..cf574f8d5 100644
--- a/sphinx/themes/basic/search.html
+++ b/sphinx/themes/basic/search.html
@@ -12,6 +12,7 @@
 {%- block scripts %}
     {{ super() }}
     <script src="{{ pathto('_static/searchtools.js', 1) }}"></script>
+    <script src="{{ pathto('_static/language_data.js', 1) }}"></script>
 {%- endblock %}
 {% block extrahead %}
   <script src="{{ pathto('searchindex.js', 1) }}" defer></script>
diff --git a/sphinx/util/inspect.py b/sphinx/util/inspect.py
index 4f4f12e1d..c7375aa57 100644
--- a/sphinx/util/inspect.py
+++ b/sphinx/util/inspect.py
@@ -20,7 +20,7 @@ import warnings
 from functools import partial, partialmethod
 from inspect import Parameter, isclass, ismethod, ismethoddescriptor, ismodule  # NOQA
 from io import StringIO
-from typing import Any, Callable, Dict, List, Mapping, Optional, Tuple, cast
+from typing import Any, Callable, Dict, List, Mapping, Optional, Sequence, Tuple, cast
 
 from sphinx.deprecation import RemovedInSphinx40Warning, RemovedInSphinx50Warning
 from sphinx.pycode.ast import ast  # for py35-37
@@ -137,6 +137,22 @@ def unwrap_all(obj: Any, *, stop: Callable = None) -> Any:
             return obj
 
 
+def getall(obj: Any) -> Optional[Sequence[str]]:
+    """Get __all__ attribute of the module as dict.
+
+    Return None if given *obj* does not have __all__.
+    Raises ValueError if given *obj* have invalid __all__.
+    """
+    __all__ = safe_getattr(obj, '__all__', None)
+    if __all__ is None:
+        return None
+    else:
+        if (isinstance(__all__, (list, tuple)) and all(isinstance(e, str) for e in __all__)):
+            return __all__
+        else:
+            raise ValueError(__all__)
+
+
 def getslots(obj: Any) -> Optional[Dict]:
     """Get __slots__ attribute of the class as dict.
 
diff --git a/tests/test_ext_autodoc_autoattribute.py b/tests/test_ext_autodoc_autoattribute.py
index ca74f9aeb..31dccbd03 100644
--- a/tests/test_ext_autodoc_autoattribute.py
+++ b/tests/test_ext_autodoc_autoattribute.py
@@ -9,6 +9,8 @@
     :license: BSD, see LICENSE for details.
 """
 
+import sys
+
 import pytest
 from test_ext_autodoc import do_autodoc
 
@@ -39,3 +41,31 @@ def test_autoattribute_novalue(app):
         '   should be documented -- süß',
         '',
     ]
+
+
+@pytest.mark.skipif(sys.version_info < (3, 6), reason='python 3.6+ is required.')
+@pytest.mark.sphinx('html', testroot='ext-autodoc')
+def test_autoattribute_typed_variable(app):
+    actual = do_autodoc(app, 'attribute', 'target.typed_vars.Class.attr2')
+    assert list(actual) == [
+        '',
+        '.. py:attribute:: Class.attr2',
+        '   :module: target.typed_vars',
+        '   :type: int',
+        '',
+    ]
+
+
+@pytest.mark.skipif(sys.version_info < (3, 6), reason='python 3.6+ is required.')
+@pytest.mark.sphinx('html', testroot='ext-autodoc')
+def test_autoattribute_instance_variable(app):
+    actual = do_autodoc(app, 'attribute', 'target.typed_vars.Class.attr4')
+    assert list(actual) == [
+        '',
+        '.. py:attribute:: Class.attr4',
+        '   :module: target.typed_vars',
+        '   :type: int',
+        '',
+        '   attr4',
+        '',
+    ]
diff --git a/tests/test_ext_autodoc_autodata.py b/tests/test_ext_autodoc_autodata.py
index 7e4471db9..72665cdba 100644
--- a/tests/test_ext_autodoc_autodata.py
+++ b/tests/test_ext_autodoc_autodata.py
@@ -9,6 +9,8 @@
     :license: BSD, see LICENSE for details.
 """
 
+import sys
+
 import pytest
 from test_ext_autodoc import do_autodoc
 
@@ -39,3 +41,34 @@ def test_autodata_novalue(app):
         '   documentation for the integer',
         '',
     ]
+
+
+@pytest.mark.skipif(sys.version_info < (3, 6), reason='python 3.6+ is required.')
+@pytest.mark.sphinx('html', testroot='ext-autodoc')
+def test_autodata_typed_variable(app):
+    actual = do_autodoc(app, 'data', 'target.typed_vars.attr2')
+    assert list(actual) == [
+        '',
+        '.. py:data:: attr2',
+        '   :module: target.typed_vars',
+        '   :type: str',
+        '',
+        '   attr2',
+        '',
+    ]
+
+
+@pytest.mark.skipif(sys.version_info < (3, 6), reason='python 3.6+ is required.')
+@pytest.mark.sphinx('html', testroot='ext-autodoc')
+def test_autodata_type_comment(app):
+    actual = do_autodoc(app, 'data', 'target.typed_vars.attr3')
+    assert list(actual) == [
+        '',
+        '.. py:data:: attr3',
+        '   :module: target.typed_vars',
+        '   :type: str',
+        "   :value: ''",
+        '',
+        '   attr3',
+        '',
+    ]