diff --git a/CHANGES b/CHANGES
index f9844e53b6f..35cea7ce45e 100644
--- a/CHANGES
+++ b/CHANGES
@@ -74,9 +74,16 @@ Incompatible changes
 Deprecated
 ----------
 
+* pending_xref node for viewcode extension
+* ``sphinx.builders.linkcheck.CheckExternalLinksBuilder.broken``
+* ``sphinx.builders.linkcheck.CheckExternalLinksBuilder.good``
+* ``sphinx.builders.linkcheck.CheckExternalLinksBuilder.redirected``
+* ``sphinx.builders.linkcheck.node_line_or_0()``
 * ``sphinx.ext.autodoc.AttributeDocumenter.isinstanceattribute()``
 * ``sphinx.ext.autodoc.directive.DocumenterBridge.reporter``
 * ``sphinx.ext.autodoc.importer.get_module_members()``
+* ``sphinx.ext.autosummary.generate._simple_info()``
+* ``sphinx.ext.autosummary.generate._simple_warn()``
 
 Features added
 --------------
@@ -84,6 +91,8 @@ Features added
 * #8022: autodoc: autodata and autoattribute directives does not show right-hand
   value of the variable if docstring contains ``:meta hide-value:`` in
   info-field-list
+* #8514: autodoc: Default values of overloaded functions are taken from actual
+  implementation if they're ellipsis
 * #8619: html: kbd role generates customizable HTML tags for compound keys
 * #8634: html: Allow to change the order of JS/CSS via ``priority`` parameter
   for :meth:`Sphinx.add_js_file()` and :meth:`Sphinx.add_css_file()`
@@ -92,12 +101,16 @@ Features added
   :event:`html-page-context` event
 * #8649: imgconverter: Skip availability check if builder supports the image
   type
+* #8573: napoleon: Allow to change the style of custom sections using
+  :confval:`napoleon_custom_styles`
 * #6241: mathjax: Include mathjax.js only on the document using equations
 * #8651: std domain: cross-reference for a rubric having inline item is broken
+* #8681: viewcode: Support incremental build
 * #8132: Add :confval:`project_copyright` as an alias of :confval:`copyright`
 * #207: Now :confval:`highlight_language` supports multiple languages
 * #2030: :rst:dir:`code-block` and :rst:dir:`literalinclude` supports automatic
   dedent via no-argument ``:dedent:`` option
+* C++, also hyperlink operator overloads in expressions and alias declarations.
 
 Bugs fixed
 ----------
@@ -109,19 +122,27 @@ Bugs fixed
 * #8315: autodoc: Failed to resolve struct.Struct type annotation
 * #8652: autodoc: All variable comments in the module are ignored if the module
   contains invalid type comments
+* #8693: autodoc: Default values for overloaded functions are rendered as string
 * #8306: autosummary: mocked modules are documented as empty page when using
   :recursive: option
 * #8618: html: kbd role produces incorrect HTML when compound-key separators (-,
   + or ^) are used as keystrokes
 * #8629: html: A type warning for html_use_opensearch is shown twice
+* #8714: html: kbd role with "Caps Lock" rendered incorrectly
 * #8665: html theme: Could not override globaltoc_maxdepth in theme.conf
+* #4304: linkcheck: Fix race condition that could lead to checking the
+  availability of the same URL twice
 * #8094: texinfo: image files on the different directory with document are not
   copied
+* #8720: viewcode: module pages are generated for epub on incremental build
+* #8704: viewcode: anchors are generated in incremental build after singlehtml
 * #8671: :confval:`highlight_options` is not working
 * #8341: C, fix intersphinx lookup types for names in declarations.
 * C, C++: in general fix intersphinx and role lookup types.
 * #8683: :confval:`html_last_updated_fmt` does not support UTC offset (%z)
 * #8683: :confval:`html_last_updated_fmt` generates wrong time zone for %Z
+* #1112: ``download`` role creates duplicated copies when relative path is
+  specified
 
 Testing
 --------
@@ -144,6 +165,10 @@ Features added
 Bugs fixed
 ----------
 
+* #8655: autodoc: Failed to generate document if target module contains an
+  object that raises an exception on ``hasattr()``
+* C, ``expr`` role should start symbol lookup in the current scope.
+
 Testing
 --------
 
diff --git a/doc/development/index.rst b/doc/development/index.rst
index 04918acd613..b4a7920ba03 100644
--- a/doc/development/index.rst
+++ b/doc/development/index.rst
@@ -2,10 +2,12 @@
 Extending Sphinx
 ================
 
-This guide is aimed at those wishing to develop their own extensions for
-Sphinx. Sphinx possesses significant extensibility capabilities including the
-ability to hook into almost every point of the build process.  If you simply
-wish to use Sphinx with existing extensions, refer to :doc:`/usage/index`.
+This guide is aimed at giving a quick introduction for those wishing to 
+develop their own extensions for Sphinx. Sphinx possesses significant 
+extensibility capabilities including the ability to hook into almost every
+point of the build process.  If you simply wish to use Sphinx with existing 
+extensions, refer to :doc:`/usage/index`. For a more detailed discussion of
+the extension interface see :doc:`/extdev/index`.
 
 .. toctree::
    :maxdepth: 2
diff --git a/doc/extdev/deprecated.rst b/doc/extdev/deprecated.rst
index c03703c0cd3..c3993efd463 100644
--- a/doc/extdev/deprecated.rst
+++ b/doc/extdev/deprecated.rst
@@ -61,6 +61,31 @@ The following is a list of deprecated interfaces.
      - 6.0
      - ``docutils.utils.smartyquotes``
 
+   * - pending_xref node for viewcode extension
+     - 3.5
+     - 5.0
+     - ``sphinx.ext.viewcode.viewcode_anchor``
+
+   * - ``sphinx.builders.linkcheck.CheckExternalLinksBuilder.broken``
+     - 3.5
+     - 5.0
+     - N/A
+
+   * - ``sphinx.builders.linkcheck.CheckExternalLinksBuilder.good``
+     - 3.5
+     - 5.0
+     - N/A
+
+   * - ``sphinx.builders.linkcheck.CheckExternalLinksBuilder.redirected``
+     - 3.5
+     - 5.0
+     - N/A
+
+   * - ``sphinx.builders.linkcheck.node_line_or_0()``
+     - 3.5
+     - 5.0
+     - ``sphinx.util.nodes.get_node_line()``
+
    * - ``sphinx.ext.autodoc.AttributeDocumenter.isinstanceattribute()``
      - 3.5
      - 5.0
@@ -71,6 +96,16 @@ The following is a list of deprecated interfaces.
      - 5.0
      - ``sphinx.ext.autodoc.ModuleDocumenter.get_module_members()``
 
+   * - ``sphinx.ext.autosummary.generate._simple_info()``
+     - 3.5
+     - 5.0
+     - :ref:`logging-api`
+
+   * - ``sphinx.ext.autosummary.generate._simple_warn()``
+     - 3.5
+     - 5.0
+     - :ref:`logging-api`
+
    * - The ``follow_wrapped`` argument of ``sphinx.util.inspect.signature()``
      - 3.4
      - 5.0
diff --git a/doc/latex.rst b/doc/latex.rst
index 53fe9301a84..35e38acb478 100644
--- a/doc/latex.rst
+++ b/doc/latex.rst
@@ -195,8 +195,8 @@ Keys that you may want to override include:
    "Bjornstrup".  You can also set this to ``''`` to disable fncychap.
 
    Default: ``'\\usepackage[Bjarne]{fncychap}'`` for English documents,
-       ``'\\usepackage[Sonny]{fncychap}'`` for internationalized documents, and
-       ``''`` for Japanese documents.
+   ``'\\usepackage[Sonny]{fncychap}'`` for internationalized documents, and
+   ``''`` for Japanese documents.
 
 ``'preamble'``
    Additional preamble content.  One may move all needed macros into some file
@@ -300,7 +300,7 @@ Keys that don't need to be overridden unless in special cases are:
    "inputenc" package inclusion.
 
    Default: ``'\\usepackage[utf8]{inputenc}'`` when using pdflatex, else
-       ``''``
+   ``''``
 
    .. versionchanged:: 1.4.3
       Previously ``'\\usepackage[utf8]{inputenc}'`` was used for all
@@ -389,7 +389,7 @@ Keys that don't need to be overridden unless in special cases are:
    key is ignored.
 
    Default: ``'\\usepackage{textalpha}'`` or ``''`` if ``fontenc`` does not
-       include the ``LGR`` option.
+   include the ``LGR`` option.
 
    .. versionadded:: 2.0
 
@@ -407,7 +407,7 @@ Keys that don't need to be overridden unless in special cases are:
    <latexsphinxsetup>`.
 
    Default: ``'\\usepackage{geometry}'`` (or
-       ``'\\usepackage[dvipdfm]{geometry}'`` for Japanese documents)
+   ``'\\usepackage[dvipdfm]{geometry}'`` for Japanese documents)
 
    .. versionadded:: 1.5
 
@@ -784,14 +784,14 @@ macros may be significant.
    |warningbdcolors|
        The colour for the admonition frame.
 
-       Default: ``{rgb}{0,0,0}`` (black)
+   Default: ``{rgb}{0,0,0}`` (black)
 
 .. only:: latex
 
    |wgbdcolorslatex|
        The colour for the admonition frame.
 
-       Default: ``{rgb}{0,0,0}`` (black)
+   Default: ``{rgb}{0,0,0}`` (black)
 
 |warningbgcolors|
     The background colours for the respective admonitions.
diff --git a/doc/usage/extensions/napoleon.rst b/doc/usage/extensions/napoleon.rst
index cf5b3080f6a..066c56e2d11 100644
--- a/doc/usage/extensions/napoleon.rst
+++ b/doc/usage/extensions/napoleon.rst
@@ -546,4 +546,28 @@ sure that "sphinx.ext.napoleon" is enabled in `conf.py`::
    If an attribute is documented in the docstring without a type and
    has an annotation in the class body, that type is used.
 
-   .. versionadded:: 3.4
\ No newline at end of file
+   .. versionadded:: 3.4
+
+.. confval:: napoleon_custom_sections
+
+   Add a list of custom sections to include, expanding the list of parsed sections.
+   *Defaults to None.*
+
+   The entries can either be strings or tuples, depending on the intention:
+
+   * To create a custom "generic" section, just pass a string.
+   * To create an alias for an existing section, pass a tuple containing the
+     alias name and the original, in that order.
+   * To create a custom section that displays like the parameters or returns
+     section, pass a tuple containing the custom section name and a string
+     value, "params_style" or "returns_style".
+
+   If an entry is just a string, it is interpreted as a header for a generic
+   section. If the entry is a tuple/list/indexed container, the first entry
+   is the name of the section, the second is the section key to emulate. If the
+   second entry value is "params_style" or "returns_style", the custom section
+   will be displayed like the parameters section or returns section.
+
+   .. versionadded:: 1.8
+   .. versionchanged:: 3.5
+      Support ``params_style`` and ``returns_style``
\ No newline at end of file
diff --git a/setup.py b/setup.py
index a0c8ac1028b..9258fded218 100644
--- a/setup.py
+++ b/setup.py
@@ -44,7 +44,7 @@
     'lint': [
         'flake8>=3.5.0',
         'isort',
-        'mypy>=0.790',
+        'mypy>=0.800',
         'docutils-stubs',
     ],
     'test': [
diff --git a/sphinx/builders/html/__init__.py b/sphinx/builders/html/__init__.py
index faee0a9769c..a5dfe4104aa 100644
--- a/sphinx/builders/html/__init__.py
+++ b/sphinx/builders/html/__init__.py
@@ -88,7 +88,7 @@ class Stylesheet(str):
 
     def __new__(cls, filename: str, *args: str, priority: int = 500, **attributes: Any
                 ) -> "Stylesheet":
-        self = str.__new__(cls, filename)  # type: ignore
+        self = str.__new__(cls, filename)
         self.filename = filename
         self.priority = priority
         self.attributes = attributes
@@ -113,7 +113,7 @@ class JavaScript(str):
     priority = None     # type: int
 
     def __new__(cls, filename: str, priority: int = 500, **attributes: str) -> "JavaScript":
-        self = str.__new__(cls, filename)  # type: ignore
+        self = str.__new__(cls, filename)
         self.filename = filename
         self.priority = priority
         self.attributes = attributes
diff --git a/sphinx/builders/html/transforms.py b/sphinx/builders/html/transforms.py
index 29a9899361e..cb9af5f2895 100644
--- a/sphinx/builders/html/transforms.py
+++ b/sphinx/builders/html/transforms.py
@@ -9,7 +9,7 @@
 """
 
 import re
-from typing import Any, Dict
+from typing import Any, Dict, List
 
 from docutils import nodes
 
@@ -38,18 +38,29 @@ class KeyboardTransform(SphinxPostTransform):
     default_priority = 400
     builders = ('html',)
     pattern = re.compile(r'(?<=.)(-|\+|\^|\s+)(?=.)')
+    multiwords_keys = (('caps', 'lock'),
+                       ('page' 'down'),
+                       ('page', 'up'),
+                       ('scroll' 'lock'),
+                       ('num', 'lock'),
+                       ('sys' 'rq'),
+                       ('back' 'space'))
 
     def run(self, **kwargs: Any) -> None:
         matcher = NodeMatcher(nodes.literal, classes=["kbd"])
         for node in self.document.traverse(matcher):  # type: nodes.literal
             parts = self.pattern.split(node[-1].astext())
-            if len(parts) == 1:
+            if len(parts) == 1 or self.is_multiwords_key(parts):
                 continue
 
             node['classes'].append('compound')
             node.pop()
             while parts:
-                key = parts.pop(0)
+                if self.is_multiwords_key(parts):
+                    key = ''.join(parts[:3])
+                    parts[:3] = []
+                else:
+                    key = parts.pop(0)
                 node += nodes.literal('', key, classes=["kbd"])
 
                 try:
@@ -59,6 +70,16 @@ def run(self, **kwargs: Any) -> None:
                 except IndexError:
                     pass
 
+    def is_multiwords_key(self, parts: List[str]) -> bool:
+        if len(parts) >= 3 and parts[1].strip() == '':
+            name = parts[0].lower(), parts[2].lower()
+            if name in self.multiwords_keys:
+                return True
+            else:
+                return False
+        else:
+            return False
+
 
 def setup(app: Sphinx) -> Dict[str, Any]:
     app.add_post_transform(KeyboardTransform)
diff --git a/sphinx/builders/linkcheck.py b/sphinx/builders/linkcheck.py
index cfcc182e1d0..f813922ec8c 100644
--- a/sphinx/builders/linkcheck.py
+++ b/sphinx/builders/linkcheck.py
@@ -14,21 +14,24 @@
 import socket
 import threading
 import time
+import warnings
 from datetime import datetime, timezone
 from email.utils import parsedate_to_datetime
 from html.parser import HTMLParser
 from os import path
-from typing import Any, Dict, List, NamedTuple, Optional, Set, Tuple
+from typing import Any, Dict, List, NamedTuple, Optional, Set, Tuple, cast
 from urllib.parse import unquote, urlparse
 
 from docutils import nodes
-from docutils.nodes import Element, Node
+from docutils.nodes import Element
 from requests import Response
 from requests.exceptions import HTTPError, TooManyRedirects
 
 from sphinx.application import Sphinx
-from sphinx.builders import Builder
+from sphinx.builders.dummy import DummyBuilder
+from sphinx.deprecation import RemovedInSphinx50Warning
 from sphinx.locale import __
+from sphinx.transforms.post_transforms import SphinxPostTransform
 from sphinx.util import encode_uri, logging, requests
 from sphinx.util.console import darkgray, darkgreen, purple, red, turquoise  # type: ignore
 from sphinx.util.nodes import get_node_line
@@ -37,6 +40,10 @@
 
 uri_re = re.compile('([a-z]+:)?//')  # matches to foo:// and // (a protocol relative URL)
 
+Hyperlink = NamedTuple('Hyperlink', (('next_check', float),
+                                     ('uri', Optional[str]),
+                                     ('docname', Optional[str]),
+                                     ('lineno', Optional[int])))
 RateLimit = NamedTuple('RateLimit', (('delay', float), ('next_check', float)))
 
 DEFAULT_REQUEST_HEADERS = {
@@ -52,6 +59,8 @@ def node_line_or_0(node: Element) -> int:
     PriorityQueue items must be comparable. The line number is part of the
     tuple used by the PriorityQueue, keep an homogeneous type for comparison.
     """
+    warnings.warn('node_line_or_0() is deprecated.',
+                  RemovedInSphinx50Warning, stacklevel=2)
     return get_node_line(node) or 0
 
 
@@ -89,7 +98,7 @@ def check_anchor(response: requests.requests.Response, anchor: str) -> bool:
     return parser.found
 
 
-class CheckExternalLinksBuilder(Builder):
+class CheckExternalLinksBuilder(DummyBuilder):
     """
     Checks for broken external links.
     """
@@ -98,14 +107,15 @@ class CheckExternalLinksBuilder(Builder):
                 '%(outdir)s/output.txt')
 
     def init(self) -> None:
+        self.hyperlinks = {}    # type: Dict[str, Hyperlink]
         self.to_ignore = [re.compile(x) for x in self.app.config.linkcheck_ignore]
         self.anchors_ignore = [re.compile(x)
                                for x in self.app.config.linkcheck_anchors_ignore]
         self.auth = [(re.compile(pattern), auth_info) for pattern, auth_info
                      in self.app.config.linkcheck_auth]
-        self.good = set()       # type: Set[str]
-        self.broken = {}        # type: Dict[str, str]
-        self.redirected = {}    # type: Dict[str, Tuple[str, int]]
+        self._good = set()       # type: Set[str]
+        self._broken = {}        # type: Dict[str, str]
+        self._redirected = {}    # type: Dict[str, Tuple[str, int]]
         # set a timeout for non-responding servers
         socket.setdefaulttimeout(5.0)
         # create output file
@@ -123,6 +133,33 @@ def init(self) -> None:
             thread.start()
             self.workers.append(thread)
 
+    @property
+    def good(self):
+        warnings.warn(
+            "%s.%s is deprecated." % (self.__class__.__name__, "good"),
+            RemovedInSphinx50Warning,
+            stacklevel=2,
+        )
+        return self._good
+
+    @property
+    def broken(self):
+        warnings.warn(
+            "%s.%s is deprecated." % (self.__class__.__name__, "broken"),
+            RemovedInSphinx50Warning,
+            stacklevel=2,
+        )
+        return self._broken
+
+    @property
+    def redirected(self):
+        warnings.warn(
+            "%s.%s is deprecated." % (self.__class__.__name__, "redirected"),
+            RemovedInSphinx50Warning,
+            stacklevel=2,
+        )
+        return self._redirected
+
     def check_thread(self) -> None:
         kwargs = {}
         if self.app.config.linkcheck_timeout:
@@ -251,14 +288,14 @@ def check(docname: str) -> Tuple[str, str, int]:
                             if rex.match(uri):
                                 return 'ignored', '', 0
                         else:
-                            self.broken[uri] = ''
+                            self._broken[uri] = ''
                             return 'broken', '', 0
-            elif uri in self.good:
+            elif uri in self._good:
                 return 'working', 'old', 0
-            elif uri in self.broken:
-                return 'broken', self.broken[uri], 0
-            elif uri in self.redirected:
-                return 'redirected', self.redirected[uri][0], self.redirected[uri][1]
+            elif uri in self._broken:
+                return 'broken', self._broken[uri], 0
+            elif uri in self._redirected:
+                return 'redirected', self._redirected[uri][0], self._redirected[uri][1]
             for rex in self.to_ignore:
                 if rex.match(uri):
                     return 'ignored', '', 0
@@ -270,11 +307,11 @@ def check(docname: str) -> Tuple[str, str, int]:
                     break
 
             if status == "working":
-                self.good.add(uri)
+                self._good.add(uri)
             elif status == "broken":
-                self.broken[uri] = info
+                self._broken[uri] = info
             elif status == "redirected":
-                self.redirected[uri] = (info, code)
+                self._redirected[uri] = (info, code)
 
             return (status, info, code)
 
@@ -396,65 +433,69 @@ def process_result(self, result: Tuple[str, str, int, str, str, int]) -> None:
                              lineno, uri + ' to ' + info)
             self.write_linkstat(linkstat)
 
-    def get_target_uri(self, docname: str, typ: str = None) -> str:
-        return ''
-
-    def get_outdated_docs(self) -> Set[str]:
-        return self.env.found_docs
+    def write_entry(self, what: str, docname: str, filename: str, line: int,
+                    uri: str) -> None:
+        with open(path.join(self.outdir, 'output.txt'), 'a') as output:
+            output.write("%s:%s: [%s] %s\n" % (filename, line, what, uri))
 
-    def prepare_writing(self, docnames: Set[str]) -> None:
-        return
+    def write_linkstat(self, data: dict) -> None:
+        with open(path.join(self.outdir, 'output.json'), 'a') as output:
+            output.write(json.dumps(data))
+            output.write('\n')
 
-    def write_doc(self, docname: str, doctree: Node) -> None:
+    def finish(self) -> None:
         logger.info('')
         n = 0
 
-        # reference nodes
-        for refnode in doctree.traverse(nodes.reference):
-            if 'refuri' not in refnode:
-                continue
-            uri = refnode['refuri']
-            lineno = node_line_or_0(refnode)
-            uri_info = (CHECK_IMMEDIATELY, uri, docname, lineno)
-            self.wqueue.put(uri_info, False)
+        for hyperlink in self.hyperlinks.values():
+            self.wqueue.put(hyperlink, False)
             n += 1
 
-        # image nodes
-        for imgnode in doctree.traverse(nodes.image):
-            uri = imgnode['candidates'].get('?')
-            if uri and '://' in uri:
-                lineno = node_line_or_0(imgnode)
-                uri_info = (CHECK_IMMEDIATELY, uri, docname, lineno)
-                self.wqueue.put(uri_info, False)
-                n += 1
-
         done = 0
         while done < n:
             self.process_result(self.rqueue.get())
             done += 1
 
-        if self.broken:
+        if self._broken:
             self.app.statuscode = 1
 
-    def write_entry(self, what: str, docname: str, filename: str, line: int,
-                    uri: str) -> None:
-        with open(path.join(self.outdir, 'output.txt'), 'a') as output:
-            output.write("%s:%s: [%s] %s\n" % (filename, line, what, uri))
-
-    def write_linkstat(self, data: dict) -> None:
-        with open(path.join(self.outdir, 'output.json'), 'a') as output:
-            output.write(json.dumps(data))
-            output.write('\n')
-
-    def finish(self) -> None:
         self.wqueue.join()
         # Shutdown threads.
         for worker in self.workers:
             self.wqueue.put((CHECK_IMMEDIATELY, None, None, None), False)
 
 
+class HyperlinkCollector(SphinxPostTransform):
+    builders = ('linkcheck',)
+    default_priority = 800
+
+    def run(self, **kwargs: Any) -> None:
+        builder = cast(CheckExternalLinksBuilder, self.app.builder)
+        hyperlinks = builder.hyperlinks
+
+        # reference nodes
+        for refnode in self.document.traverse(nodes.reference):
+            if 'refuri' not in refnode:
+                continue
+            uri = refnode['refuri']
+            lineno = get_node_line(refnode)
+            uri_info = Hyperlink(CHECK_IMMEDIATELY, uri, self.env.docname, lineno)
+            if uri not in hyperlinks:
+                hyperlinks[uri] = uri_info
+
+        # image nodes
+        for imgnode in self.document.traverse(nodes.image):
+            uri = imgnode['candidates'].get('?')
+            if uri and '://' in uri:
+                lineno = get_node_line(imgnode)
+                uri_info = Hyperlink(CHECK_IMMEDIATELY, uri, self.env.docname, lineno)
+                if uri not in hyperlinks:
+                    hyperlinks[uri] = uri_info
+
+
 def setup(app: Sphinx) -> Dict[str, Any]:
     app.add_builder(CheckExternalLinksBuilder)
+    app.add_post_transform(HyperlinkCollector)
 
     app.add_config_value('linkcheck_ignore', [], None)
     app.add_config_value('linkcheck_auth', [], None)
diff --git a/sphinx/domains/c.py b/sphinx/domains/c.py
index 064318e08ca..5336b003c89 100644
--- a/sphinx/domains/c.py
+++ b/sphinx/domains/c.py
@@ -137,8 +137,7 @@ def describe_signature(self, signode: TextElement, mode: str, env: "BuildEnviron
                                           reftype='identifier',
                                           reftarget=targetText, modname=None,
                                           classname=None)
-            key = symbol.get_lookup_key()
-            pnode['c:parent_key'] = key
+            pnode['c:parent_key'] = symbol.get_lookup_key()
             if self.is_anon():
                 pnode += nodes.strong(text="[anonymous]")
             else:
@@ -3204,7 +3203,8 @@ def parse_definition(self, parser: DefinitionParser) -> ASTDeclaration:
     def parse_pre_v3_type_definition(self, parser: DefinitionParser) -> ASTDeclaration:
         return parser.parse_pre_v3_type_definition()
 
-    def describe_signature(self, signode: TextElement, ast: Any, options: Dict) -> None:
+    def describe_signature(self, signode: TextElement, ast: ASTDeclaration,
+                           options: Dict) -> None:
         ast.describe_signature(signode, 'lastIsName', self.env, options)
 
     def run(self) -> List[Node]:
@@ -3642,7 +3642,7 @@ def run(self) -> Tuple[List[Node], List[system_message]]:
                            location=self.get_source_info())
             # see below
             return [self.node_type(text, text, classes=classes)], []
-        parentSymbol = self.env.temp_data.get('cpp:parent_symbol', None)
+        parentSymbol = self.env.temp_data.get('c:parent_symbol', None)
         if parentSymbol is None:
             parentSymbol = self.env.domaindata['c']['root_symbol']
         # ...most if not all of these classes should really apply to the individual references,
diff --git a/sphinx/domains/cpp.py b/sphinx/domains/cpp.py
index 4d6e189a31e..25e6f1421b6 100644
--- a/sphinx/domains/cpp.py
+++ b/sphinx/domains/cpp.py
@@ -1592,6 +1592,15 @@ def describe_signature(self, signode: TextElement, mode: str,
         identifier = str(self)
         if mode == 'lastIsName':
             signode += addnodes.desc_name(identifier, identifier)
+        elif mode == 'markType':
+            targetText = prefix + identifier + templateArgs
+            pnode = addnodes.pending_xref('', refdomain='cpp',
+                                          reftype='identifier',
+                                          reftarget=targetText, modname=None,
+                                          classname=None)
+            pnode['cpp:parent_key'] = symbol.get_lookup_key()
+            pnode += nodes.Text(identifier)
+            signode += pnode
         else:
             signode += addnodes.desc_addname(identifier, identifier)
 
diff --git a/sphinx/environment/__init__.py b/sphinx/environment/__init__.py
index 2121b3ee465..28599c977f4 100644
--- a/sphinx/environment/__init__.py
+++ b/sphinx/environment/__init__.py
@@ -10,6 +10,7 @@
 
 import os
 import pickle
+import posixpath
 from collections import defaultdict
 from copy import copy
 from datetime import datetime
@@ -340,9 +341,9 @@ def relfn2path(self, filename: str, docname: str = None) -> Tuple[str, str]:
             docdir = path.dirname(self.doc2path(docname or self.docname,
                                                 base=None))
             rel_fn = path.join(docdir, filename)
-        # the path.abspath() might seem redundant, but otherwise artifacts
-        # such as ".." will remain in the path
-        return rel_fn, path.abspath(path.join(self.srcdir, rel_fn))
+
+        return (posixpath.normpath(rel_fn),
+                path.normpath(path.join(self.srcdir, rel_fn)))
 
     @property
     def found_docs(self) -> Set[str]:
diff --git a/sphinx/ext/autodoc/__init__.py b/sphinx/ext/autodoc/__init__.py
index f66852a34b1..ee74db37009 100644
--- a/sphinx/ext/autodoc/__init__.py
+++ b/sphinx/ext/autodoc/__init__.py
@@ -1338,8 +1338,11 @@ def format_signature(self, **kwargs: Any) -> str:
                     documenter.objpath = [None]
                     sigs.append(documenter.format_signature())
         if overloaded:
+            actual = inspect.signature(self.object,
+                                       type_aliases=self.config.autodoc_type_aliases)
             __globals__ = safe_getattr(self.object, '__globals__', {})
             for overload in self.analyzer.overloads.get('.'.join(self.objpath)):
+                overload = self.merge_default_value(actual, overload)
                 overload = evaluate_signature(overload, __globals__,
                                               self.config.autodoc_type_aliases)
 
@@ -1348,6 +1351,16 @@ def format_signature(self, **kwargs: Any) -> str:
 
         return "\n".join(sigs)
 
+    def merge_default_value(self, actual: Signature, overload: Signature) -> Signature:
+        """Merge default values of actual implementation to the overload variants."""
+        parameters = list(overload.parameters.values())
+        for i, param in enumerate(parameters):
+            actual_param = actual.parameters.get(param.name)
+            if actual_param and param.default == '...':
+                parameters[i] = param.replace(default=actual_param.default)
+
+        return overload.replace(parameters=parameters)
+
     def annotate_to_first_argument(self, func: Callable, typ: Type) -> None:
         """Annotate type hint to the first argument of function if needed."""
         try:
@@ -2096,8 +2109,16 @@ def format_signature(self, **kwargs: Any) -> str:
                     documenter.objpath = [None]
                     sigs.append(documenter.format_signature())
         if overloaded:
+            if inspect.isstaticmethod(self.object, cls=self.parent, name=self.object_name):
+                actual = inspect.signature(self.object, bound_method=False,
+                                           type_aliases=self.config.autodoc_type_aliases)
+            else:
+                actual = inspect.signature(self.object, bound_method=True,
+                                           type_aliases=self.config.autodoc_type_aliases)
+
             __globals__ = safe_getattr(self.object, '__globals__', {})
             for overload in self.analyzer.overloads.get('.'.join(self.objpath)):
+                overload = self.merge_default_value(actual, overload)
                 overload = evaluate_signature(overload, __globals__,
                                               self.config.autodoc_type_aliases)
 
@@ -2110,6 +2131,16 @@ def format_signature(self, **kwargs: Any) -> str:
 
         return "\n".join(sigs)
 
+    def merge_default_value(self, actual: Signature, overload: Signature) -> Signature:
+        """Merge default values of actual implementation to the overload variants."""
+        parameters = list(overload.parameters.values())
+        for i, param in enumerate(parameters):
+            actual_param = actual.parameters.get(param.name)
+            if actual_param and param.default == '...':
+                parameters[i] = param.replace(default=actual_param.default)
+
+        return overload.replace(parameters=parameters)
+
     def annotate_to_first_argument(self, func: Callable, typ: Type) -> None:
         """Annotate type hint to the first argument of function if needed."""
         try:
diff --git a/sphinx/ext/autosummary/generate.py b/sphinx/ext/autosummary/generate.py
index f972124dc68..59f526744d1 100644
--- a/sphinx/ext/autosummary/generate.py
+++ b/sphinx/ext/autosummary/generate.py
@@ -97,10 +97,14 @@ def setup_documenters(app: Any) -> None:
 
 
 def _simple_info(msg: str) -> None:
+    warnings.warn('_simple_info() is deprecated.',
+                  RemovedInSphinx50Warning, stacklevel=2)
     print(msg)
 
 
 def _simple_warn(msg: str) -> None:
+    warnings.warn('_simple_warn() is deprecated.',
+                  RemovedInSphinx50Warning, stacklevel=2)
     print('WARNING: ' + msg, file=sys.stderr)
 
 
diff --git a/sphinx/ext/napoleon/__init__.py b/sphinx/ext/napoleon/__init__.py
index 5b2715bac09..4a8c2135aa7 100644
--- a/sphinx/ext/napoleon/__init__.py
+++ b/sphinx/ext/napoleon/__init__.py
@@ -253,10 +253,15 @@ def __unicode__(self):
           * To create a custom "generic" section, just pass a string.
           * To create an alias for an existing section, pass a tuple containing the
             alias name and the original, in that order.
+          * To create a custom section that displays like the parameters or returns
+            section, pass a tuple containing the custom section name and a string
+            value, "params_style" or "returns_style".
 
         If an entry is just a string, it is interpreted as a header for a generic
         section. If the entry is a tuple/list/indexed container, the first entry
-        is the name of the section, the second is the section key to emulate.
+        is the name of the section, the second is the section key to emulate. If the
+        second entry value is "params_style" or "returns_style", the custom section
+        will be displayed like the parameters section or returns section.
 
     napoleon_attr_annotations : :obj:`bool` (Defaults to True)
         Use the type annotations of class attributes that are documented in the docstring
diff --git a/sphinx/ext/napoleon/docstring.py b/sphinx/ext/napoleon/docstring.py
index a5a986e4980..a7dc969d5e1 100644
--- a/sphinx/ext/napoleon/docstring.py
+++ b/sphinx/ext/napoleon/docstring.py
@@ -544,11 +544,18 @@ def _load_custom_sections(self) -> None:
                     self._sections[entry.lower()] = self._parse_custom_generic_section
                 else:
                     # otherwise, assume entry is container;
-                    # [0] is new section, [1] is the section to alias.
-                    # in the case of key mismatch, just handle as generic section.
-                    self._sections[entry[0].lower()] = \
-                        self._sections.get(entry[1].lower(),
-                                           self._parse_custom_generic_section)
+                    if entry[1] == "params_style":
+                        self._sections[entry[0].lower()] = \
+                            self._parse_custom_params_style_section
+                    elif entry[1] == "returns_style":
+                        self._sections[entry[0].lower()] = \
+                            self._parse_custom_returns_style_section
+                    else:
+                        # [0] is new section, [1] is the section to alias.
+                        # in the case of key mismatch, just handle as generic section.
+                        self._sections[entry[0].lower()] = \
+                            self._sections.get(entry[1].lower(),
+                                               self._parse_custom_generic_section)
 
     def _parse(self) -> None:
         self._parsed_lines = self._consume_empty()
@@ -636,6 +643,13 @@ def _parse_custom_generic_section(self, section: str) -> List[str]:
         # for now, no admonition for simple custom sections
         return self._parse_generic_section(section, False)
 
+    def _parse_custom_params_style_section(self, section: str) -> List[str]:
+        return self._format_fields(section, self._consume_fields())
+
+    def _parse_custom_returns_style_section(self, section: str) -> List[str]:
+        fields = self._consume_returns_section()
+        return self._format_fields(section, fields)
+
     def _parse_usage_section(self, section: str) -> List[str]:
         header = ['.. rubric:: Usage:', '']
         block = ['.. code-block:: python', '']
diff --git a/sphinx/ext/viewcode.py b/sphinx/ext/viewcode.py
index 3459e45caf8..baf86dbbff3 100644
--- a/sphinx/ext/viewcode.py
+++ b/sphinx/ext/viewcode.py
@@ -8,8 +8,11 @@
     :license: BSD, see LICENSE for details.
 """
 
+import posixpath
 import traceback
-from typing import Any, Dict, Iterable, Iterator, Set, Tuple
+import warnings
+from os import path
+from typing import Any, Dict, Generator, Iterable, Optional, Set, Tuple, cast
 
 from docutils import nodes
 from docutils.nodes import Element, Node
@@ -17,16 +20,32 @@
 import sphinx
 from sphinx import addnodes
 from sphinx.application import Sphinx
+from sphinx.builders import Builder
+from sphinx.builders.html import StandaloneHTMLBuilder
+from sphinx.deprecation import RemovedInSphinx50Warning
 from sphinx.environment import BuildEnvironment
 from sphinx.locale import _, __
 from sphinx.pycode import ModuleAnalyzer
+from sphinx.transforms.post_transforms import SphinxPostTransform
 from sphinx.util import get_full_modname, logging, status_iterator
 from sphinx.util.nodes import make_refnode
 
 logger = logging.getLogger(__name__)
 
 
-def _get_full_modname(app: Sphinx, modname: str, attribute: str) -> str:
+OUTPUT_DIRNAME = '_modules'
+
+
+class viewcode_anchor(Element):
+    """Node for viewcode anchors.
+
+    This node will be processed in the resolving phase.
+    For viewcode supported builders, they will be all converted to the anchors.
+    For not supported builders, they will be removed.
+    """
+
+
+def _get_full_modname(app: Sphinx, modname: str, attribute: str) -> Optional[str]:
     try:
         return get_full_modname(modname, attribute)
     except AttributeError:
@@ -44,14 +63,21 @@ def _get_full_modname(app: Sphinx, modname: str, attribute: str) -> str:
         return None
 
 
+def is_supported_builder(builder: Builder) -> bool:
+    if builder.format != 'html':
+        return False
+    elif builder.name == 'singlehtml':
+        return False
+    elif builder.name.startswith('epub') and not builder.config.viewcode_enable_epub:
+        return False
+    else:
+        return True
+
+
 def doctree_read(app: Sphinx, doctree: Node) -> None:
     env = app.builder.env
     if not hasattr(env, '_viewcode_modules'):
         env._viewcode_modules = {}  # type: ignore
-    if app.builder.name == "singlehtml":
-        return
-    if app.builder.name.startswith("epub") and not env.config.viewcode_enable_epub:
-        return
 
     def has_tag(modname: str, fullname: str, docname: str, refname: str) -> bool:
         entry = env._viewcode_modules.get(modname, None)  # type: ignore
@@ -108,13 +134,8 @@ def has_tag(modname: str, fullname: str, docname: str, refname: str) -> bool:
                 # only one link per name, please
                 continue
             names.add(fullname)
-            pagename = '_modules/' + modname.replace('.', '/')
-            inline = nodes.inline('', _('[source]'), classes=['viewcode-link'])
-            onlynode = addnodes.only(expr='html')
-            onlynode += addnodes.pending_xref('', inline, reftype='viewcode', refdomain='std',
-                                              refexplicit=False, reftarget=pagename,
-                                              refid=fullname, refdoc=env.docname)
-            signode += onlynode
+            pagename = posixpath.join(OUTPUT_DIRNAME, modname.replace('.', '/'))
+            signode += viewcode_anchor(reftarget=pagename, refid=fullname, refdoc=env.docname)
 
 
 def env_merge_info(app: Sphinx, env: BuildEnvironment, docnames: Iterable[str],
@@ -128,20 +149,80 @@ def env_merge_info(app: Sphinx, env: BuildEnvironment, docnames: Iterable[str],
     env._viewcode_modules.update(other._viewcode_modules)  # type: ignore
 
 
+class ViewcodeAnchorTransform(SphinxPostTransform):
+    """Convert or remove viewcode_anchor nodes depends on builder."""
+    default_priority = 100
+
+    def run(self, **kwargs: Any) -> None:
+        if is_supported_builder(self.app.builder):
+            self.convert_viewcode_anchors()
+        else:
+            self.remove_viewcode_anchors()
+
+    def convert_viewcode_anchors(self) -> None:
+        for node in self.document.traverse(viewcode_anchor):
+            anchor = nodes.inline('', _('[source]'), classes=['viewcode-link'])
+            refnode = make_refnode(self.app.builder, node['refdoc'], node['reftarget'],
+                                   node['refid'], anchor)
+            node.replace_self(refnode)
+
+    def remove_viewcode_anchors(self) -> None:
+        for node in self.document.traverse(viewcode_anchor):
+            node.parent.remove(node)
+
+
 def missing_reference(app: Sphinx, env: BuildEnvironment, node: Element, contnode: Node
-                      ) -> Node:
+                      ) -> Optional[Node]:
     # resolve our "viewcode" reference nodes -- they need special treatment
     if node['reftype'] == 'viewcode':
+        warnings.warn('viewcode extension is no longer use pending_xref node. '
+                      'Please update your extension.', RemovedInSphinx50Warning)
         return make_refnode(app.builder, node['refdoc'], node['reftarget'],
                             node['refid'], contnode)
 
     return None
 
 
-def collect_pages(app: Sphinx) -> Iterator[Tuple[str, Dict[str, Any], str]]:
+def get_module_filename(app: Sphinx, modname: str) -> Optional[str]:
+    """Get module filename for *modname*."""
+    source_info = app.emit_firstresult('viewcode-find-source', modname)
+    if source_info:
+        return None
+    else:
+        try:
+            filename, source = ModuleAnalyzer.get_module_source(modname)
+            return filename
+        except Exception:
+            return None
+
+
+def should_generate_module_page(app: Sphinx, modname: str) -> bool:
+    """Check generation of module page is needed."""
+    module_filename = get_module_filename(app, modname)
+    if module_filename is None:
+        # Always (re-)generate module page when module filename is not found.
+        return True
+
+    builder = cast(StandaloneHTMLBuilder, app.builder)
+    basename = modname.replace('.', '/') + builder.out_suffix
+    page_filename = path.join(app.outdir, '_modules/', basename)
+
+    try:
+        if path.getmtime(module_filename) <= path.getmtime(page_filename):
+            # generation is not needed if the HTML page is newer than module file.
+            return False
+    except IOError:
+        pass
+
+    return True
+
+
+def collect_pages(app: Sphinx) -> Generator[Tuple[str, Dict[str, Any], str], None, None]:
     env = app.builder.env
     if not hasattr(env, '_viewcode_modules'):
         return
+    if not is_supported_builder(app.builder):
+        return
     highlighter = app.builder.highlighter  # type: ignore
     urito = app.builder.get_relative_uri
 
@@ -154,9 +235,12 @@ def collect_pages(app: Sphinx) -> Iterator[Tuple[str, Dict[str, Any], str]]:
             app.verbosity, lambda x: x[0]):
         if not entry:
             continue
+        if not should_generate_module_page(app, modname):
+            continue
+
         code, tags, used, refname = entry
         # construct a page name for the highlighted source
-        pagename = '_modules/' + modname.replace('.', '/')
+        pagename = posixpath.join(OUTPUT_DIRNAME, modname.replace('.', '/'))
         # highlight the source using the builder's highlighter
         if env.config.highlight_language in ('python3', 'default', 'none'):
             lexer = env.config.highlight_language
@@ -188,10 +272,10 @@ def collect_pages(app: Sphinx) -> Iterator[Tuple[str, Dict[str, Any], str]]:
             parent = parent.rsplit('.', 1)[0]
             if parent in modnames:
                 parents.append({
-                    'link': urito(pagename, '_modules/' +
-                                  parent.replace('.', '/')),
+                    'link': urito(pagename,
+                                  posixpath.join(OUTPUT_DIRNAME, parent.replace('.', '/'))),
                     'title': parent})
-        parents.append({'link': urito(pagename, '_modules/index'),
+        parents.append({'link': urito(pagename, posixpath.join(OUTPUT_DIRNAME, 'index')),
                         'title': _('Module code')})
         parents.reverse()
         # putting it all together
@@ -220,7 +304,8 @@ def collect_pages(app: Sphinx) -> Iterator[Tuple[str, Dict[str, Any], str]]:
                 html.append('</ul>')
             stack.append(modname + '.')
         html.append('<li><a href="%s">%s</a></li>\n' % (
-            urito('_modules/index', '_modules/' + modname.replace('.', '/')),
+            urito(posixpath.join(OUTPUT_DIRNAME, 'index'),
+                  posixpath.join(OUTPUT_DIRNAME, modname.replace('.', '/'))),
             modname))
     html.append('</ul>' * (len(stack) - 1))
     context = {
@@ -229,7 +314,7 @@ def collect_pages(app: Sphinx) -> Iterator[Tuple[str, Dict[str, Any], str]]:
                  ''.join(html)),
     }
 
-    yield ('_modules/index', context, 'page.html')
+    yield (posixpath.join(OUTPUT_DIRNAME, 'index'), context, 'page.html')
 
 
 def setup(app: Sphinx) -> Dict[str, Any]:
@@ -244,6 +329,7 @@ def setup(app: Sphinx) -> Dict[str, Any]:
     # app.add_config_value('viewcode_exclude_modules', [], 'env')
     app.add_event('viewcode-find-source')
     app.add_event('viewcode-follow-imported')
+    app.add_post_transform(ViewcodeAnchorTransform)
     return {
         'version': sphinx.__display_version__,
         'env_version': 1,
diff --git a/sphinx/transforms/post_transforms/__init__.py b/sphinx/transforms/post_transforms/__init__.py
index 2c563540a9c..1c424050ab8 100644
--- a/sphinx/transforms/post_transforms/__init__.py
+++ b/sphinx/transforms/post_transforms/__init__.py
@@ -8,7 +8,7 @@
     :license: BSD, see LICENSE for details.
 """
 
-from typing import Any, Dict, List, Tuple, Type, cast
+from typing import Any, Dict, List, Optional, Tuple, Type, cast
 
 from docutils import nodes
 from docutils.nodes import Element
@@ -150,7 +150,7 @@ def stringify(name: str, node: Element) -> str:
         return newnode
 
     def warn_missing_reference(self, refdoc: str, typ: str, target: str,
-                               node: pending_xref, domain: Domain) -> None:
+                               node: pending_xref, domain: Optional[Domain]) -> None:
         warn = node.get('refwarn')
         if self.config.nitpicky:
             warn = True
diff --git a/sphinx/util/inspect.py b/sphinx/util/inspect.py
index 85186cf0b27..f797339cf9f 100644
--- a/sphinx/util/inspect.py
+++ b/sphinx/util/inspect.py
@@ -482,6 +482,19 @@ def is_builtin_class_method(obj: Any, attr_name: str) -> bool:
     return getattr(builtins, name, None) is cls
 
 
+class DefaultValue:
+    """A simple wrapper for default value of the parameters of overload functions."""
+
+    def __init__(self, value: str) -> None:
+        self.value = value
+
+    def __eq__(self, other: object) -> bool:
+        return self.value == other
+
+    def __repr__(self) -> str:
+        return self.value
+
+
 def _should_unwrap(subject: Callable) -> bool:
     """Check the function should be unwrapped on getting signature."""
     if (safe_getattr(subject, '__globals__', None) and
@@ -687,7 +700,7 @@ def signature_from_ast(node: ast.FunctionDef, code: str = '') -> inspect.Signatu
             if defaults[i] is Parameter.empty:
                 default = Parameter.empty
             else:
-                default = ast_unparse(defaults[i], code)
+                default = DefaultValue(ast_unparse(defaults[i], code))
 
             annotation = ast_unparse(arg.annotation, code) or Parameter.empty
             params.append(Parameter(arg.arg, Parameter.POSITIONAL_ONLY,
@@ -697,7 +710,7 @@ def signature_from_ast(node: ast.FunctionDef, code: str = '') -> inspect.Signatu
         if defaults[i + posonlyargs] is Parameter.empty:
             default = Parameter.empty
         else:
-            default = ast_unparse(defaults[i + posonlyargs], code)
+            default = DefaultValue(ast_unparse(defaults[i + posonlyargs], code))
 
         annotation = ast_unparse(arg.annotation, code) or Parameter.empty
         params.append(Parameter(arg.arg, Parameter.POSITIONAL_OR_KEYWORD,
diff --git a/sphinx/writers/latex.py b/sphinx/writers/latex.py
index 0a76425735a..fc597ec0881 100644
--- a/sphinx/writers/latex.py
+++ b/sphinx/writers/latex.py
@@ -1203,7 +1203,6 @@ def is_inline(self, node: Element) -> bool:
         return isinstance(node.parent, nodes.TextElement)
 
     def visit_image(self, node: Element) -> None:
-        attrs = node.attributes
         pre = []    # type: List[str]
                     # in reverse order
         post = []   # type: List[str]
@@ -1213,27 +1212,27 @@ def visit_image(self, node: Element) -> None:
             is_inline = self.is_inline(node.parent)
         else:
             is_inline = self.is_inline(node)
-        if 'width' in attrs:
-            if 'scale' in attrs:
-                w = self.latex_image_length(attrs['width'], attrs['scale'])
+        if 'width' in node:
+            if 'scale' in node:
+                w = self.latex_image_length(node['width'], node['scale'])
             else:
-                w = self.latex_image_length(attrs['width'])
+                w = self.latex_image_length(node['width'])
             if w:
                 include_graphics_options.append('width=%s' % w)
-        if 'height' in attrs:
-            if 'scale' in attrs:
-                h = self.latex_image_length(attrs['height'], attrs['scale'])
+        if 'height' in node:
+            if 'scale' in node:
+                h = self.latex_image_length(node['height'], node['scale'])
             else:
-                h = self.latex_image_length(attrs['height'])
+                h = self.latex_image_length(node['height'])
             if h:
                 include_graphics_options.append('height=%s' % h)
-        if 'scale' in attrs:
+        if 'scale' in node:
             if not include_graphics_options:
                 # if no "width" nor "height", \sphinxincludegraphics will fit
                 # to the available text width if oversized after rescaling.
                 include_graphics_options.append('scale=%s'
-                                                % (float(attrs['scale']) / 100.0))
-        if 'align' in attrs:
+                                                % (float(node['scale']) / 100.0))
+        if 'align' in node:
             align_prepost = {
                 # By default latex aligns the top of an image.
                 (1, 'top'): ('', ''),
@@ -1247,8 +1246,8 @@ def visit_image(self, node: Element) -> None:
                 (0, 'right'): ('{\\hspace*{\\fill}', '}'),
             }
             try:
-                pre.append(align_prepost[is_inline, attrs['align']][0])
-                post.append(align_prepost[is_inline, attrs['align']][1])
+                pre.append(align_prepost[is_inline, node['align']][0])
+                post.append(align_prepost[is_inline, node['align']][1])
             except KeyError:
                 pass
         if self.in_parsed_literal:
diff --git a/sphinx/writers/texinfo.py b/sphinx/writers/texinfo.py
index a70ffd5e46e..d9187429994 100644
--- a/sphinx/writers/texinfo.py
+++ b/sphinx/writers/texinfo.py
@@ -1205,11 +1205,10 @@ def visit_image(self, node: Element) -> None:
             # ignore remote images
             return
         name, ext = path.splitext(uri)
-        attrs = node.attributes
         # width and height ignored in non-tex output
-        width = self.tex_image_length(attrs.get('width', ''))
-        height = self.tex_image_length(attrs.get('height', ''))
-        alt = self.escape_arg(attrs.get('alt', ''))
+        width = self.tex_image_length(node.get('width', ''))
+        height = self.tex_image_length(node.get('height', ''))
+        alt = self.escape_arg(node.get('alt', ''))
         filename = "%s-figures/%s" % (self.elements['filename'][:-5], name)  # type: ignore
         self.body.append('\n@image{%s,%s,%s,%s,%s}\n' %
                          (filename, width, height, alt, ext[1:]))
diff --git a/tests/roots/test-domain-c/ns_lookup.rst b/tests/roots/test-domain-c/ns_lookup.rst
new file mode 100644
index 00000000000..87f9d68e731
--- /dev/null
+++ b/tests/roots/test-domain-c/ns_lookup.rst
@@ -0,0 +1,13 @@
+.. c:namespace:: ns_lookup
+
+.. c:var:: int i
+
+.. c:function:: void f(int j)
+
+	- :c:var:`i`
+	- :c:var:`j`
+	- :c:expr:`i`
+	- :c:expr:`j`
+
+- :c:var:`i`
+- :c:expr:`i`
diff --git a/tests/roots/test-ext-autodoc/target/overload.py b/tests/roots/test-ext-autodoc/target/overload.py
index cc4e509f259..1b395ee5b34 100644
--- a/tests/roots/test-ext-autodoc/target/overload.py
+++ b/tests/roots/test-ext-autodoc/target/overload.py
@@ -2,21 +2,21 @@
 
 
 @overload
-def sum(x: int, y: int) -> int:
+def sum(x: int, y: int = 0) -> int:
     ...
 
 
 @overload
-def sum(x: "float", y: "float") -> "float":
+def sum(x: "float", y: "float" = 0.0) -> "float":
     ...
 
 
 @overload
-def sum(x: str, y: str) -> str:
+def sum(x: str, y: str = ...) -> str:
     ...
 
 
-def sum(x, y):
+def sum(x, y=None):
     """docstring"""
     return x + y
 
@@ -25,18 +25,18 @@ class Math:
     """docstring"""
 
     @overload
-    def sum(self, x: int, y: int) -> int:
+    def sum(self, x: int, y: int = 0) -> int:
         ...
 
     @overload
-    def sum(self, x: "float", y: "float") -> "float":
+    def sum(self, x: "float", y: "float" = 0.0) -> "float":
         ...
 
     @overload
-    def sum(self, x: str, y: str) -> str:
+    def sum(self, x: str, y: str = ...) -> str:
         ...
 
-    def sum(self, x, y):
+    def sum(self, x, y=None):
         """docstring"""
         return x + y
 
diff --git a/tests/roots/test-linkcheck-localserver-two-links/conf.py b/tests/roots/test-linkcheck-localserver-two-links/conf.py
deleted file mode 100644
index a45d22e2821..00000000000
--- a/tests/roots/test-linkcheck-localserver-two-links/conf.py
+++ /dev/null
@@ -1 +0,0 @@
-exclude_patterns = ['_build']
diff --git a/tests/roots/test-linkcheck-localserver-two-links/index.rst b/tests/roots/test-linkcheck-localserver-two-links/index.rst
deleted file mode 100644
index 4c1bcfd6a13..00000000000
--- a/tests/roots/test-linkcheck-localserver-two-links/index.rst
+++ /dev/null
@@ -1,6 +0,0 @@
-.. image:: http://localhost:7777/
-   :target: http://localhost:7777/
-
-`weblate.org`_
-
-.. _weblate.org: http://localhost:7777/
diff --git a/tests/test_build_linkcheck.py b/tests/test_build_linkcheck.py
index 8427dfb599f..55a2bf233f4 100644
--- a/tests/test_build_linkcheck.py
+++ b/tests/test_build_linkcheck.py
@@ -573,40 +573,3 @@ def test_limit_rate_bails_out_after_waiting_max_time(app):
     checker.rate_limits = {"localhost": RateLimit(90.0, 0.0)}
     next_check = checker.limit_rate(FakeResponse())
     assert next_check is None
-
-
-@pytest.mark.sphinx(
-    'linkcheck', testroot='linkcheck-localserver-two-links', freshenv=True,
-)
-def test_priorityqueue_items_are_comparable(app):
-    with http_server(OKHandler):
-        app.builder.build_all()
-    content = (app.outdir / 'output.json').read_text()
-    rows = [json.loads(x) for x in sorted(content.splitlines())]
-    assert rows == [
-        {
-            'filename': 'index.rst',
-            # Should not be None.
-            'lineno': 0,
-            'status': 'working',
-            'code': 0,
-            'uri': 'http://localhost:7777/',
-            'info': '',
-        },
-        {
-            'filename': 'index.rst',
-            'lineno': 0,
-            'status': 'working',
-            'code': 0,
-            'uri': 'http://localhost:7777/',
-            'info': '',
-        },
-        {
-            'filename': 'index.rst',
-            'lineno': 4,
-            'status': 'working',
-            'code': 0,
-            'uri': 'http://localhost:7777/',
-            'info': '',
-        }
-    ]
diff --git a/tests/test_domain_c.py b/tests/test_domain_c.py
index 0f17fd04119..2cfcf74faf4 100644
--- a/tests/test_domain_c.py
+++ b/tests/test_domain_c.py
@@ -598,6 +598,13 @@ def test_build_function_param_target(app, warning):
     ]
 
 
+@pytest.mark.sphinx(testroot='domain-c', confoverrides={'nitpicky': True})
+def test_build_ns_lookup(app, warning):
+    app.builder.build_all()
+    ws = filter_warnings(warning, "ns_lookup")
+    assert len(ws) == 0
+
+
 def _get_obj(app, queryName):
     domain = app.env.get_domain('c')
     for name, dispname, objectType, docname, anchor, prio in domain.get_objects():
diff --git a/tests/test_environment.py b/tests/test_environment.py
index 650d12bfbee..bad06baa4d7 100644
--- a/tests/test_environment.py
+++ b/tests/test_environment.py
@@ -138,6 +138,11 @@ def test_env_relfn2path(app):
     assert relfn == '../logo.jpg'
     assert absfn == app.srcdir.parent / 'logo.jpg'
 
+    # relative path traversal
+    relfn, absfn = app.env.relfn2path('subdir/../logo.jpg', 'index')
+    assert relfn == 'logo.jpg'
+    assert absfn == app.srcdir / 'logo.jpg'
+
     # omit docname (w/ current docname)
     app.env.temp_data['docname'] = 'subdir/document'
     relfn, absfn = app.env.relfn2path('images/logo.jpg')
diff --git a/tests/test_ext_autodoc.py b/tests/test_ext_autodoc.py
index e00ab0ee25d..aed5fa5bb17 100644
--- a/tests/test_ext_autodoc.py
+++ b/tests/test_ext_autodoc.py
@@ -2067,17 +2067,17 @@ def test_overload(app):
         '   docstring',
         '',
         '',
-        '   .. py:method:: Math.sum(x: int, y: int) -> int',
-        '                  Math.sum(x: float, y: float) -> float',
-        '                  Math.sum(x: str, y: str) -> str',
+        '   .. py:method:: Math.sum(x: int, y: int = 0) -> int',
+        '                  Math.sum(x: float, y: float = 0.0) -> float',
+        '                  Math.sum(x: str, y: str = None) -> str',
         '      :module: target.overload',
         '',
         '      docstring',
         '',
         '',
-        '.. py:function:: sum(x: int, y: int) -> int',
-        '                 sum(x: float, y: float) -> float',
-        '                 sum(x: str, y: str) -> str',
+        '.. py:function:: sum(x: int, y: int = 0) -> int',
+        '                 sum(x: float, y: float = 0.0) -> float',
+        '                 sum(x: str, y: str = None) -> str',
         '   :module: target.overload',
         '',
         '   docstring',
diff --git a/tests/test_ext_autodoc_configs.py b/tests/test_ext_autodoc_configs.py
index 9cd5f5e32ed..bae684397b5 100644
--- a/tests/test_ext_autodoc_configs.py
+++ b/tests/test_ext_autodoc_configs.py
@@ -647,13 +647,13 @@ def test_autodoc_typehints_none_for_overload(app):
         '   docstring',
         '',
         '',
-        '   .. py:method:: Math.sum(x, y)',
+        '   .. py:method:: Math.sum(x, y=None)',
         '      :module: target.overload',
         '',
         '      docstring',
         '',
         '',
-        '.. py:function:: sum(x, y)',
+        '.. py:function:: sum(x, y=None)',
         '   :module: target.overload',
         '',
         '   docstring',
diff --git a/tests/test_ext_napoleon_docstring.py b/tests/test_ext_napoleon_docstring.py
index 4ee66aaa5df..47561fd7116 100644
--- a/tests/test_ext_napoleon_docstring.py
+++ b/tests/test_ext_napoleon_docstring.py
@@ -1072,10 +1072,27 @@ def test_custom_generic_sections(self):
 Sooper Warning:
     Stop hitting yourself!
 """, """:Warns: **Stop hitting yourself!**
+"""),
+                      ("""\
+Params Style:
+    arg1 (int): Description of arg1
+    arg2 (str): Description of arg2
+
+""", """\
+:Params Style: * **arg1** (*int*) -- Description of arg1
+               * **arg2** (*str*) -- Description of arg2
+"""),
+                      ("""\
+Returns Style:
+    description of custom section
+
+""", """:Returns Style: description of custom section
 """))
 
         testConfig = Config(napoleon_custom_sections=['Really Important Details',
-                                                      ('Sooper Warning', 'warns')])
+                                                      ('Sooper Warning', 'warns'),
+                                                      ('Params Style', 'params_style'),
+                                                      ('Returns Style', 'returns_style')])
 
         for docstring, expected in docstrings:
             actual = str(GoogleDocstring(docstring, testConfig))
diff --git a/tests/test_ext_viewcode.py b/tests/test_ext_viewcode.py
index 79864095b51..d75fb71966d 100644
--- a/tests/test_ext_viewcode.py
+++ b/tests/test_ext_viewcode.py
@@ -49,6 +49,27 @@ def test_viewcode(app, status, warning):
             '<span>    &quot;&quot;&quot;</span></div>\n') in result
 
 
+@pytest.mark.sphinx('epub', testroot='ext-viewcode')
+def test_viewcode_epub_default(app, status, warning):
+    app.builder.build_all()
+
+    assert not (app.outdir / '_modules/spam/mod1.xhtml').exists()
+
+    result = (app.outdir / 'index.xhtml').read_text()
+    assert result.count('href="_modules/spam/mod1.xhtml#func1"') == 0
+
+
+@pytest.mark.sphinx('epub', testroot='ext-viewcode',
+                    confoverrides={'viewcode_enable_epub': True})
+def test_viewcode_epub_enabled(app, status, warning):
+    app.builder.build_all()
+
+    assert (app.outdir / '_modules/spam/mod1.xhtml').exists()
+
+    result = (app.outdir / 'index.xhtml').read_text()
+    assert result.count('href="_modules/spam/mod1.xhtml#func1"') == 2
+
+
 @pytest.mark.sphinx(testroot='ext-viewcode', tags=['test_linkcode'])
 def test_linkcode(app, status, warning):
     app.builder.build(['objects'])
diff --git a/tests/test_markup.py b/tests/test_markup.py
index e762dbb3b2b..8341b882656 100644
--- a/tests/test_markup.py
+++ b/tests/test_markup.py
@@ -284,6 +284,13 @@ def get(name):
         '<p><kbd class="kbd docutils literal notranslate">-</kbd></p>',
         '\\sphinxkeyboard{\\sphinxupquote{\\sphinxhyphen{}}}',
     ),
+    (
+        # kbd role
+        'verify',
+        ':kbd:`Caps Lock`',
+        '<p><kbd class="kbd docutils literal notranslate">Caps Lock</kbd></p>',
+        '\\sphinxkeyboard{\\sphinxupquote{Caps Lock}}',
+    ),
     (
         # non-interpolation of dashes in option role
         'verify_re',
diff --git a/utils/release-checklist b/utils/release-checklist
index 671f932d816..477ddcbbef9 100644
--- a/utils/release-checklist
+++ b/utils/release-checklist
@@ -18,10 +18,10 @@ for stable releases
 * ``python utils/bump_version.py --in-develop X.Y.Zb0`` (ex. 1.5.3b0)
 * Check diff by ``git diff``
 * ``git commit -am 'Bump version'``
-* ``git push origin X.Y --tags``
-* ``git checkout master``
-* ``git merge X.Y``
-* ``git push origin master``
+* ``git push origin X.Y.x --tags``
+* ``git checkout X.x``
+* ``git merge X.Y.x``
+* ``git push origin X.x``
 * Add new version/milestone to tracker categories
 * Write announcement and send to sphinx-dev, sphinx-users and python-announce
 
@@ -43,10 +43,10 @@ for first beta releases
 * ``python utils/bump_version.py --in-develop X.Y.0b2`` (ex. 1.6.0b2)
 * Check diff by ``git diff``
 * ``git commit -am 'Bump version'``
-* ``git checkout -b X.Y``
-* ``git push origin X.Y --tags``
+* ``git checkout -b X.x``
+* ``git push origin X.x --tags``
 * ``git checkout master``
-* ``git merge X.Y``
+* ``git merge X.x``
 * ``python utils/bump_version.py --in-develop A.B.0b0`` (ex. 1.7.0b0)
 * Check diff by ``git diff``
 * ``git commit -am 'Bump version'``
@@ -71,9 +71,9 @@ for other beta releases
 * ``python utils/bump_version.py --in-develop X.Y.0bM`` (ex. 1.6.0b3)
 * Check diff by `git diff``
 * ``git commit -am 'Bump version'``
-* ``git push origin X.Y --tags``
+* ``git push origin X.x --tags``
 * ``git checkout master``
-* ``git merge X.Y``
+* ``git merge X.x``
 * ``git push origin master``
 * Add new version/milestone to tracker categories
 * Write announcement and send to sphinx-dev, sphinx-users and python-announce
@@ -99,9 +99,9 @@ for major releases
 * ``python utils/bump_version.py --in-develop X.Y.1b0`` (ex. 1.6.1b0)
 * Check diff by ``git diff``
 * ``git commit -am 'Bump version'``
-* ``git push origin X.Y --tags``
+* ``git push origin X.x --tags``
 * ``git checkout master``
-* ``git merge X.Y``
+* ``git merge X.x``
 * ``git push origin master``
 * open https://github.com/sphinx-doc/sphinx/settings/branches and make ``A.B`` branch *not* protected
 * ``git checkout A.B`` (checkout old stable)