diff --git a/pyrightconfig.stricter.json b/pyrightconfig.stricter.json
index d50ee1dd9..5974705a5 100644
--- a/pyrightconfig.stricter.json
+++ b/pyrightconfig.stricter.json
@@ -30,6 +30,7 @@
         "stubs/cryptography",
         "stubs/docutils",
         "stubs/Flask",
+        "stubs/html5lib",
         "stubs/Jinja2",
         "stubs/Markdown",
         "stubs/Pillow",
diff --git a/stubs/html5lib/@tests/requirements-stubtest.txt b/stubs/html5lib/@tests/requirements-stubtest.txt
new file mode 100644
index 000000000..0bf46c1cc
--- /dev/null
+++ b/stubs/html5lib/@tests/requirements-stubtest.txt
@@ -0,0 +1,2 @@
+genshi
+lxml
diff --git a/stubs/html5lib/@tests/stubtest_allowlist.txt b/stubs/html5lib/@tests/stubtest_allowlist.txt
new file mode 100644
index 000000000..fe341582b
--- /dev/null
+++ b/stubs/html5lib/@tests/stubtest_allowlist.txt
@@ -0,0 +1,2 @@
+# Misnamed first argument in implementation
+html5lib._inputstream.EncodingBytes.__new__
diff --git a/stubs/html5lib/METADATA.toml b/stubs/html5lib/METADATA.toml
new file mode 100644
index 000000000..bad265e4f
--- /dev/null
+++ b/stubs/html5lib/METADATA.toml
@@ -0,0 +1 @@
+version = "1.1"
diff --git a/stubs/html5lib/html5lib/__init__.pyi b/stubs/html5lib/html5lib/__init__.pyi
new file mode 100644
index 000000000..709bc6613
--- /dev/null
+++ b/stubs/html5lib/html5lib/__init__.pyi
@@ -0,0 +1,6 @@
+from .html5parser import HTMLParser as HTMLParser, parse as parse, parseFragment as parseFragment
+from .serializer import serialize as serialize
+from .treebuilders import getTreeBuilder as getTreeBuilder
+from .treewalkers import getTreeWalker as getTreeWalker
+
+__version__: str
diff --git a/stubs/html5lib/html5lib/_ihatexml.pyi b/stubs/html5lib/html5lib/_ihatexml.pyi
new file mode 100644
index 000000000..dff7e852e
--- /dev/null
+++ b/stubs/html5lib/html5lib/_ihatexml.pyi
@@ -0,0 +1,55 @@
+from typing import Any
+
+baseChar: str
+ideographic: str
+combiningCharacter: str
+digit: str
+extender: str
+letter: Any
+name: Any
+nameFirst: Any
+reChar: Any
+reCharRange: Any
+
+def charStringToList(chars): ...
+def normaliseCharList(charList): ...
+
+max_unicode: Any
+
+def missingRanges(charList): ...
+def listToRegexpStr(charList): ...
+def hexToInt(hex_str): ...
+def escapeRegexp(string): ...
+
+nonXmlNameBMPRegexp: Any
+nonXmlNameFirstBMPRegexp: Any
+nonPubidCharRegexp: Any
+
+class InfosetFilter:
+    replacementRegexp: Any
+    dropXmlnsLocalName: Any
+    dropXmlnsAttrNs: Any
+    preventDoubleDashComments: Any
+    preventDashAtCommentEnd: Any
+    replaceFormFeedCharacters: Any
+    preventSingleQuotePubid: Any
+    replaceCache: Any
+    def __init__(
+        self,
+        dropXmlnsLocalName: bool = ...,
+        dropXmlnsAttrNs: bool = ...,
+        preventDoubleDashComments: bool = ...,
+        preventDashAtCommentEnd: bool = ...,
+        replaceFormFeedCharacters: bool = ...,
+        preventSingleQuotePubid: bool = ...,
+    ) -> None: ...
+    def coerceAttribute(self, name, namespace: Any | None = ...): ...
+    def coerceElement(self, name): ...
+    def coerceComment(self, data): ...
+    def coerceCharacters(self, data): ...
+    def coercePubid(self, data): ...
+    def toXmlName(self, name): ...
+    def getReplacementCharacter(self, char): ...
+    def fromXmlName(self, name): ...
+    def escapeChar(self, char): ...
+    def unescapeChar(self, charcode): ...
diff --git a/stubs/html5lib/html5lib/_inputstream.pyi b/stubs/html5lib/html5lib/_inputstream.pyi
new file mode 100644
index 000000000..ad08d3587
--- /dev/null
+++ b/stubs/html5lib/html5lib/_inputstream.pyi
@@ -0,0 +1,109 @@
+from typing import Any
+
+spaceCharactersBytes: Any
+asciiLettersBytes: Any
+asciiUppercaseBytes: Any
+spacesAngleBrackets: Any
+invalid_unicode_no_surrogate: str
+invalid_unicode_re: Any
+non_bmp_invalid_codepoints: Any
+ascii_punctuation_re: Any
+charsUntilRegEx: Any
+
+class BufferedStream:
+    stream: Any
+    buffer: Any
+    position: Any
+    def __init__(self, stream) -> None: ...
+    def tell(self): ...
+    def seek(self, pos) -> None: ...
+    def read(self, bytes): ...
+
+def HTMLInputStream(source, **kwargs): ...
+
+class HTMLUnicodeInputStream:
+    reportCharacterErrors: Any
+    newLines: Any
+    charEncoding: Any
+    dataStream: Any
+    def __init__(self, source) -> None: ...
+    chunk: str
+    chunkSize: int
+    chunkOffset: int
+    errors: Any
+    prevNumLines: int
+    prevNumCols: int
+    def reset(self) -> None: ...
+    def openStream(self, source): ...
+    def position(self): ...
+    def char(self): ...
+    def readChunk(self, chunkSize: Any | None = ...): ...
+    def characterErrorsUCS4(self, data) -> None: ...
+    def characterErrorsUCS2(self, data) -> None: ...
+    def charsUntil(self, characters, opposite: bool = ...): ...
+    def unget(self, char) -> None: ...
+
+class HTMLBinaryInputStream(HTMLUnicodeInputStream):
+    rawStream: Any
+    numBytesMeta: int
+    numBytesChardet: int
+    override_encoding: Any
+    transport_encoding: Any
+    same_origin_parent_encoding: Any
+    likely_encoding: Any
+    default_encoding: Any
+    charEncoding: Any
+    def __init__(
+        self,
+        source,
+        override_encoding: Any | None = ...,
+        transport_encoding: Any | None = ...,
+        same_origin_parent_encoding: Any | None = ...,
+        likely_encoding: Any | None = ...,
+        default_encoding: str = ...,
+        useChardet: bool = ...,
+    ) -> None: ...
+    dataStream: Any
+    def reset(self) -> None: ...
+    def openStream(self, source): ...
+    def determineEncoding(self, chardet: bool = ...): ...
+    def changeEncoding(self, newEncoding) -> None: ...
+    def detectBOM(self): ...
+    def detectEncodingMeta(self): ...
+
+class EncodingBytes(bytes):
+    def __new__(cls, value): ...
+    def __init__(self, value) -> None: ...
+    def __iter__(self): ...
+    def __next__(self): ...
+    def next(self): ...
+    def previous(self): ...
+    def setPosition(self, position) -> None: ...
+    def getPosition(self): ...
+    position: Any
+    def getCurrentByte(self): ...
+    currentByte: Any
+    def skip(self, chars=...): ...
+    def skipUntil(self, chars): ...
+    def matchBytes(self, bytes): ...
+    def jumpTo(self, bytes): ...
+
+class EncodingParser:
+    data: Any
+    encoding: Any
+    def __init__(self, data) -> None: ...
+    def getEncoding(self): ...
+    def handleComment(self): ...
+    def handleMeta(self): ...
+    def handlePossibleStartTag(self): ...
+    def handlePossibleEndTag(self): ...
+    def handlePossibleTag(self, endTag): ...
+    def handleOther(self): ...
+    def getAttribute(self): ...
+
+class ContentAttrParser:
+    data: Any
+    def __init__(self, data) -> None: ...
+    def parse(self): ...
+
+def lookupEncoding(encoding): ...
diff --git a/stubs/html5lib/html5lib/_tokenizer.pyi b/stubs/html5lib/html5lib/_tokenizer.pyi
new file mode 100644
index 000000000..cf62e2ca6
--- /dev/null
+++ b/stubs/html5lib/html5lib/_tokenizer.pyi
@@ -0,0 +1,93 @@
+import sys
+from collections import OrderedDict
+from typing import Any, Dict
+
+entitiesTrie: Any
+if sys.version_info >= (3, 7):
+    attributeMap = Dict[Any, Any]
+else:
+    attributeMap = OrderedDict[Any, Any]
+
+class HTMLTokenizer:
+    stream: Any
+    parser: Any
+    escapeFlag: bool
+    lastFourChars: Any
+    state: Any
+    escape: bool
+    currentToken: Any
+    def __init__(self, stream, parser: Any | None = ..., **kwargs) -> None: ...
+    tokenQueue: Any
+    def __iter__(self): ...
+    def consumeNumberEntity(self, isHex): ...
+    def consumeEntity(self, allowedChar: Any | None = ..., fromAttribute: bool = ...) -> None: ...
+    def processEntityInAttribute(self, allowedChar) -> None: ...
+    def emitCurrentToken(self) -> None: ...
+    def dataState(self): ...
+    def entityDataState(self): ...
+    def rcdataState(self): ...
+    def characterReferenceInRcdata(self): ...
+    def rawtextState(self): ...
+    def scriptDataState(self): ...
+    def plaintextState(self): ...
+    def tagOpenState(self): ...
+    def closeTagOpenState(self): ...
+    def tagNameState(self): ...
+    temporaryBuffer: str
+    def rcdataLessThanSignState(self): ...
+    def rcdataEndTagOpenState(self): ...
+    def rcdataEndTagNameState(self): ...
+    def rawtextLessThanSignState(self): ...
+    def rawtextEndTagOpenState(self): ...
+    def rawtextEndTagNameState(self): ...
+    def scriptDataLessThanSignState(self): ...
+    def scriptDataEndTagOpenState(self): ...
+    def scriptDataEndTagNameState(self): ...
+    def scriptDataEscapeStartState(self): ...
+    def scriptDataEscapeStartDashState(self): ...
+    def scriptDataEscapedState(self): ...
+    def scriptDataEscapedDashState(self): ...
+    def scriptDataEscapedDashDashState(self): ...
+    def scriptDataEscapedLessThanSignState(self): ...
+    def scriptDataEscapedEndTagOpenState(self): ...
+    def scriptDataEscapedEndTagNameState(self): ...
+    def scriptDataDoubleEscapeStartState(self): ...
+    def scriptDataDoubleEscapedState(self): ...
+    def scriptDataDoubleEscapedDashState(self): ...
+    def scriptDataDoubleEscapedDashDashState(self): ...
+    def scriptDataDoubleEscapedLessThanSignState(self): ...
+    def scriptDataDoubleEscapeEndState(self): ...
+    def beforeAttributeNameState(self): ...
+    def attributeNameState(self): ...
+    def afterAttributeNameState(self): ...
+    def beforeAttributeValueState(self): ...
+    def attributeValueDoubleQuotedState(self): ...
+    def attributeValueSingleQuotedState(self): ...
+    def attributeValueUnQuotedState(self): ...
+    def afterAttributeValueState(self): ...
+    def selfClosingStartTagState(self): ...
+    def bogusCommentState(self): ...
+    def markupDeclarationOpenState(self): ...
+    def commentStartState(self): ...
+    def commentStartDashState(self): ...
+    def commentState(self): ...
+    def commentEndDashState(self): ...
+    def commentEndState(self): ...
+    def commentEndBangState(self): ...
+    def doctypeState(self): ...
+    def beforeDoctypeNameState(self): ...
+    def doctypeNameState(self): ...
+    def afterDoctypeNameState(self): ...
+    def afterDoctypePublicKeywordState(self): ...
+    def beforeDoctypePublicIdentifierState(self): ...
+    def doctypePublicIdentifierDoubleQuotedState(self): ...
+    def doctypePublicIdentifierSingleQuotedState(self): ...
+    def afterDoctypePublicIdentifierState(self): ...
+    def betweenDoctypePublicAndSystemIdentifiersState(self): ...
+    def afterDoctypeSystemKeywordState(self): ...
+    def beforeDoctypeSystemIdentifierState(self): ...
+    def doctypeSystemIdentifierDoubleQuotedState(self): ...
+    def doctypeSystemIdentifierSingleQuotedState(self): ...
+    def afterDoctypeSystemIdentifierState(self): ...
+    def bogusDoctypeState(self): ...
+    def cdataSectionState(self): ...
diff --git a/stubs/html5lib/html5lib/_trie/__init__.pyi b/stubs/html5lib/html5lib/_trie/__init__.pyi
new file mode 100644
index 000000000..7095d84cb
--- /dev/null
+++ b/stubs/html5lib/html5lib/_trie/__init__.pyi
@@ -0,0 +1 @@
+from .py import Trie as Trie
diff --git a/stubs/html5lib/html5lib/_trie/_base.pyi b/stubs/html5lib/html5lib/_trie/_base.pyi
new file mode 100644
index 000000000..138c91ccd
--- /dev/null
+++ b/stubs/html5lib/html5lib/_trie/_base.pyi
@@ -0,0 +1,9 @@
+from abc import ABCMeta
+from collections.abc import Mapping
+from typing import Any
+
+class Trie(Mapping[Any, Any], metaclass=ABCMeta):
+    def keys(self, prefix: Any | None = ...): ...
+    def has_keys_with_prefix(self, prefix): ...
+    def longest_prefix(self, prefix): ...
+    def longest_prefix_item(self, prefix): ...
diff --git a/stubs/html5lib/html5lib/_trie/py.pyi b/stubs/html5lib/html5lib/_trie/py.pyi
new file mode 100644
index 000000000..cd3e66dd4
--- /dev/null
+++ b/stubs/html5lib/html5lib/_trie/py.pyi
@@ -0,0 +1,12 @@
+from typing import Any
+
+from ._base import Trie as ABCTrie
+
+class Trie(ABCTrie):
+    def __init__(self, data) -> None: ...
+    def __contains__(self, key): ...
+    def __len__(self): ...
+    def __iter__(self): ...
+    def __getitem__(self, key): ...
+    def keys(self, prefix: Any | None = ...): ...
+    def has_keys_with_prefix(self, prefix): ...
diff --git a/stubs/html5lib/html5lib/_utils.pyi b/stubs/html5lib/html5lib/_utils.pyi
new file mode 100644
index 000000000..c6f85f5a6
--- /dev/null
+++ b/stubs/html5lib/html5lib/_utils.pyi
@@ -0,0 +1,24 @@
+from collections.abc import Mapping
+from typing import Any, Dict
+
+supports_lone_surrogates: bool
+
+class MethodDispatcher(Dict[Any, Any]):
+    default: Any
+    def __init__(self, items=...) -> None: ...
+    def __getitem__(self, key): ...
+    def __get__(self, instance, owner: Any | None = ...): ...
+
+class BoundMethodDispatcher(Mapping[Any, Any]):
+    instance: Any
+    dispatcher: Any
+    def __init__(self, instance, dispatcher) -> None: ...
+    def __getitem__(self, key): ...
+    def get(self, key, default): ...
+    def __iter__(self): ...
+    def __len__(self): ...
+    def __contains__(self, key): ...
+
+def isSurrogatePair(data): ...
+def surrogatePairToCodepoint(data): ...
+def moduleFactoryFactory(factory): ...
diff --git a/stubs/html5lib/html5lib/constants.pyi b/stubs/html5lib/html5lib/constants.pyi
new file mode 100644
index 000000000..b8a3ac8f1
--- /dev/null
+++ b/stubs/html5lib/html5lib/constants.pyi
@@ -0,0 +1,37 @@
+from typing import Any
+
+EOF: Any
+E: Any
+namespaces: Any
+scopingElements: Any
+formattingElements: Any
+specialElements: Any
+htmlIntegrationPointElements: Any
+mathmlTextIntegrationPointElements: Any
+adjustSVGAttributes: Any
+adjustMathMLAttributes: Any
+adjustForeignAttributes: Any
+unadjustForeignAttributes: Any
+spaceCharacters: Any
+tableInsertModeElements: Any
+asciiLowercase: Any
+asciiUppercase: Any
+asciiLetters: Any
+digits: Any
+hexDigits: Any
+asciiUpper2Lower: Any
+headingElements: Any
+voidElements: Any
+cdataElements: Any
+rcdataElements: Any
+booleanAttributes: Any
+entitiesWindows1252: Any
+xmlEntities: Any
+entities: Any
+replacementCharacters: Any
+tokenTypes: Any
+tagTokenTypes: Any
+prefixes: Any
+
+class DataLossWarning(UserWarning): ...
+class _ReparseException(Exception): ...
diff --git a/stubs/html5lib/html5lib/filters/__init__.pyi b/stubs/html5lib/html5lib/filters/__init__.pyi
new file mode 100644
index 000000000..e69de29bb
diff --git a/stubs/html5lib/html5lib/filters/alphabeticalattributes.pyi b/stubs/html5lib/html5lib/filters/alphabeticalattributes.pyi
new file mode 100644
index 000000000..20b694d65
--- /dev/null
+++ b/stubs/html5lib/html5lib/filters/alphabeticalattributes.pyi
@@ -0,0 +1,4 @@
+from . import base
+
+class Filter(base.Filter):
+    def __iter__(self): ...
diff --git a/stubs/html5lib/html5lib/filters/base.pyi b/stubs/html5lib/html5lib/filters/base.pyi
new file mode 100644
index 000000000..16d3726e0
--- /dev/null
+++ b/stubs/html5lib/html5lib/filters/base.pyi
@@ -0,0 +1,7 @@
+from typing import Any
+
+class Filter:
+    source: Any
+    def __init__(self, source) -> None: ...
+    def __iter__(self): ...
+    def __getattr__(self, name): ...
diff --git a/stubs/html5lib/html5lib/filters/inject_meta_charset.pyi b/stubs/html5lib/html5lib/filters/inject_meta_charset.pyi
new file mode 100644
index 000000000..9cde8fde3
--- /dev/null
+++ b/stubs/html5lib/html5lib/filters/inject_meta_charset.pyi
@@ -0,0 +1,8 @@
+from typing import Any
+
+from . import base
+
+class Filter(base.Filter):
+    encoding: Any
+    def __init__(self, source, encoding) -> None: ...
+    def __iter__(self): ...
diff --git a/stubs/html5lib/html5lib/filters/lint.pyi b/stubs/html5lib/html5lib/filters/lint.pyi
new file mode 100644
index 000000000..5803963a1
--- /dev/null
+++ b/stubs/html5lib/html5lib/filters/lint.pyi
@@ -0,0 +1,8 @@
+from typing import Any
+
+from . import base
+
+class Filter(base.Filter):
+    require_matching_tags: Any
+    def __init__(self, source, require_matching_tags: bool = ...) -> None: ...
+    def __iter__(self): ...
diff --git a/stubs/html5lib/html5lib/filters/optionaltags.pyi b/stubs/html5lib/html5lib/filters/optionaltags.pyi
new file mode 100644
index 000000000..5d53a467e
--- /dev/null
+++ b/stubs/html5lib/html5lib/filters/optionaltags.pyi
@@ -0,0 +1,7 @@
+from . import base
+
+class Filter(base.Filter):
+    def slider(self) -> None: ...
+    def __iter__(self): ...
+    def is_optional_start(self, tagname, previous, next): ...
+    def is_optional_end(self, tagname, next): ...
diff --git a/stubs/html5lib/html5lib/filters/sanitizer.pyi b/stubs/html5lib/html5lib/filters/sanitizer.pyi
new file mode 100644
index 000000000..176e81a01
--- /dev/null
+++ b/stubs/html5lib/html5lib/filters/sanitizer.pyi
@@ -0,0 +1,34 @@
+from typing import Any
+
+from . import base
+
+class Filter(base.Filter):
+    allowed_elements: Any
+    allowed_attributes: Any
+    allowed_css_properties: Any
+    allowed_css_keywords: Any
+    allowed_svg_properties: Any
+    allowed_protocols: Any
+    allowed_content_types: Any
+    attr_val_is_uri: Any
+    svg_attr_val_allows_ref: Any
+    svg_allow_local_href: Any
+    def __init__(
+        self,
+        source,
+        allowed_elements=...,
+        allowed_attributes=...,
+        allowed_css_properties=...,
+        allowed_css_keywords=...,
+        allowed_svg_properties=...,
+        allowed_protocols=...,
+        allowed_content_types=...,
+        attr_val_is_uri=...,
+        svg_attr_val_allows_ref=...,
+        svg_allow_local_href=...,
+    ) -> None: ...
+    def __iter__(self): ...
+    def sanitize_token(self, token): ...
+    def allowed_token(self, token): ...
+    def disallowed_token(self, token): ...
+    def sanitize_css(self, style): ...
diff --git a/stubs/html5lib/html5lib/filters/whitespace.pyi b/stubs/html5lib/html5lib/filters/whitespace.pyi
new file mode 100644
index 000000000..117aaf641
--- /dev/null
+++ b/stubs/html5lib/html5lib/filters/whitespace.pyi
@@ -0,0 +1,11 @@
+from typing import Any
+
+from . import base
+
+SPACES_REGEX: Any
+
+class Filter(base.Filter):
+    spacePreserveElements: Any
+    def __iter__(self): ...
+
+def collapse_spaces(text): ...
diff --git a/stubs/html5lib/html5lib/html5parser.pyi b/stubs/html5lib/html5lib/html5parser.pyi
new file mode 100644
index 000000000..8b5215b0f
--- /dev/null
+++ b/stubs/html5lib/html5lib/html5parser.pyi
@@ -0,0 +1,50 @@
+from _typeshed import SupportsRead
+from typing import Any
+
+def parse(
+    doc: str | bytes | SupportsRead[str] | SupportsRead[bytes],
+    treebuilder: str = ...,
+    namespaceHTMLElements: bool = ...,
+    **kwargs,
+): ...
+def parseFragment(doc, container: str = ..., treebuilder: str = ..., namespaceHTMLElements: bool = ..., **kwargs): ...
+def method_decorator_metaclass(function): ...
+
+class HTMLParser:
+    strict: Any
+    tree: Any
+    errors: Any
+    phases: Any
+    def __init__(
+        self, tree: Any | None = ..., strict: bool = ..., namespaceHTMLElements: bool = ..., debug: bool = ...
+    ) -> None: ...
+    firstStartTag: bool
+    log: Any
+    compatMode: str
+    innerHTML: Any
+    phase: Any
+    lastPhase: Any
+    beforeRCDataPhase: Any
+    framesetOK: bool
+    def reset(self) -> None: ...
+    @property
+    def documentEncoding(self): ...
+    def isHTMLIntegrationPoint(self, element): ...
+    def isMathMLTextIntegrationPoint(self, element): ...
+    def mainLoop(self) -> None: ...
+    def parse(self, stream, *args, **kwargs): ...
+    def parseFragment(self, stream, *args, **kwargs): ...
+    def parseError(self, errorcode: str = ..., datavars: Any | None = ...) -> None: ...
+    def adjustMathMLAttributes(self, token) -> None: ...
+    def adjustSVGAttributes(self, token) -> None: ...
+    def adjustForeignAttributes(self, token) -> None: ...
+    def reparseTokenNormal(self, token) -> None: ...
+    def resetInsertionMode(self) -> None: ...
+    originalPhase: Any
+    def parseRCDataRawtext(self, token, contentType) -> None: ...
+
+def getPhases(debug): ...
+def adjust_attributes(token, replacements) -> None: ...
+def impliedTagToken(name, type: str = ..., attributes: Any | None = ..., selfClosing: bool = ...): ...
+
+class ParseError(Exception): ...
diff --git a/stubs/html5lib/html5lib/serializer.pyi b/stubs/html5lib/html5lib/serializer.pyi
new file mode 100644
index 000000000..210c725cc
--- /dev/null
+++ b/stubs/html5lib/html5lib/serializer.pyi
@@ -0,0 +1,37 @@
+from typing import Any, overload
+
+def htmlentityreplace_errors(exc: Exception) -> tuple[str | bytes, int]: ...
+@overload
+def serialize(input, tree: str = ..., encoding: None = ..., **serializer_opts) -> str: ...
+@overload
+def serialize(input, tree: str, encoding: str, **serializer_opts) -> bytes: ...
+@overload
+def serialize(input, *, encoding: str, **serializer_opts) -> bytes: ...
+
+class HTMLSerializer:
+    quote_attr_values: str
+    quote_char: str
+    use_best_quote_char: bool
+    omit_optional_tags: bool
+    minimize_boolean_attributes: bool
+    use_trailing_solidus: bool
+    space_before_trailing_solidus: bool
+    escape_lt_in_attrs: bool
+    escape_rcdata: bool
+    resolve_entities: bool
+    alphabetical_attributes: bool
+    inject_meta_charset: bool
+    strip_whitespace: bool
+    sanitize: bool
+    options: Any
+    errors: Any
+    strict: bool
+    def __init__(self, **kwargs) -> None: ...
+    def encode(self, string): ...
+    def encodeStrict(self, string): ...
+    encoding: Any
+    def serialize(self, treewalker, encoding: Any | None = ...) -> None: ...
+    def render(self, treewalker, encoding: Any | None = ...): ...
+    def serializeError(self, data: str = ...) -> None: ...
+
+class SerializeError(Exception): ...
diff --git a/stubs/html5lib/html5lib/treeadapters/__init__.pyi b/stubs/html5lib/html5lib/treeadapters/__init__.pyi
new file mode 100644
index 000000000..bf1267485
--- /dev/null
+++ b/stubs/html5lib/html5lib/treeadapters/__init__.pyi
@@ -0,0 +1 @@
+from . import genshi as genshi, sax as sax
diff --git a/stubs/html5lib/html5lib/treeadapters/genshi.pyi b/stubs/html5lib/html5lib/treeadapters/genshi.pyi
new file mode 100644
index 000000000..fa42d5d09
--- /dev/null
+++ b/stubs/html5lib/html5lib/treeadapters/genshi.pyi
@@ -0,0 +1 @@
+def to_genshi(walker) -> None: ...
diff --git a/stubs/html5lib/html5lib/treeadapters/sax.pyi b/stubs/html5lib/html5lib/treeadapters/sax.pyi
new file mode 100644
index 000000000..87ebcb1cb
--- /dev/null
+++ b/stubs/html5lib/html5lib/treeadapters/sax.pyi
@@ -0,0 +1,5 @@
+from typing import Any
+
+prefix_mapping: Any
+
+def to_sax(walker, handler) -> None: ...
diff --git a/stubs/html5lib/html5lib/treebuilders/__init__.pyi b/stubs/html5lib/html5lib/treebuilders/__init__.pyi
new file mode 100644
index 000000000..a9cd20041
--- /dev/null
+++ b/stubs/html5lib/html5lib/treebuilders/__init__.pyi
@@ -0,0 +1,5 @@
+from typing import Any
+
+treeBuilderCache: Any
+
+def getTreeBuilder(treeType, implementation: Any | None = ..., **kwargs): ...
diff --git a/stubs/html5lib/html5lib/treebuilders/base.pyi b/stubs/html5lib/html5lib/treebuilders/base.pyi
new file mode 100644
index 000000000..12e89bb29
--- /dev/null
+++ b/stubs/html5lib/html5lib/treebuilders/base.pyi
@@ -0,0 +1,55 @@
+from typing import Any, List
+
+Marker: Any
+listElementsMap: Any
+
+class Node:
+    name: Any
+    parent: Any
+    value: Any
+    attributes: Any
+    childNodes: Any
+    def __init__(self, name) -> None: ...
+    def appendChild(self, node) -> None: ...
+    def insertText(self, data, insertBefore: Any | None = ...) -> None: ...
+    def insertBefore(self, node, refNode) -> None: ...
+    def removeChild(self, node) -> None: ...
+    def reparentChildren(self, newParent) -> None: ...
+    def cloneNode(self) -> None: ...
+    def hasContent(self) -> None: ...
+
+class ActiveFormattingElements(List[Any]):
+    def append(self, node) -> None: ...
+    def nodesEqual(self, node1, node2): ...
+
+class TreeBuilder:
+    documentClass: Any
+    elementClass: Any
+    commentClass: Any
+    doctypeClass: Any
+    fragmentClass: Any
+    defaultNamespace: str
+    def __init__(self, namespaceHTMLElements) -> None: ...
+    openElements: Any
+    activeFormattingElements: Any
+    headPointer: Any
+    formPointer: Any
+    insertFromTable: bool
+    document: Any
+    def reset(self) -> None: ...
+    def elementInScope(self, target, variant: Any | None = ...): ...
+    def reconstructActiveFormattingElements(self) -> None: ...
+    def clearActiveFormattingElements(self) -> None: ...
+    def elementInActiveFormattingElements(self, name): ...
+    def insertRoot(self, token) -> None: ...
+    def insertDoctype(self, token) -> None: ...
+    def insertComment(self, token, parent: Any | None = ...) -> None: ...
+    def createElement(self, token): ...
+    def insertElementNormal(self, token): ...
+    def insertElementTable(self, token): ...
+    def insertText(self, data, parent: Any | None = ...) -> None: ...
+    def getTableMisnestedNodePosition(self): ...
+    def generateImpliedEndTags(self, exclude: Any | None = ...) -> None: ...
+    def getDocument(self): ...
+    def getFragment(self): ...
+    def testSerializer(self, node) -> None: ...
diff --git a/stubs/html5lib/html5lib/treebuilders/dom.pyi b/stubs/html5lib/html5lib/treebuilders/dom.pyi
new file mode 100644
index 000000000..12de3344d
--- /dev/null
+++ b/stubs/html5lib/html5lib/treebuilders/dom.pyi
@@ -0,0 +1,5 @@
+from typing import Any
+
+def getDomBuilder(DomImplementation): ...
+
+getDomModule: Any
diff --git a/stubs/html5lib/html5lib/treebuilders/etree.pyi b/stubs/html5lib/html5lib/treebuilders/etree.pyi
new file mode 100644
index 000000000..f4b8e54b5
--- /dev/null
+++ b/stubs/html5lib/html5lib/treebuilders/etree.pyi
@@ -0,0 +1,7 @@
+from typing import Any
+
+tag_regexp: Any
+
+def getETreeBuilder(ElementTreeImplementation, fullTree: bool = ...): ...
+
+getETreeModule: Any
diff --git a/stubs/html5lib/html5lib/treebuilders/etree_lxml.pyi b/stubs/html5lib/html5lib/treebuilders/etree_lxml.pyi
new file mode 100644
index 000000000..1016b9091
--- /dev/null
+++ b/stubs/html5lib/html5lib/treebuilders/etree_lxml.pyi
@@ -0,0 +1,43 @@
+from typing import Any
+
+from . import base
+
+fullTree: bool
+tag_regexp: Any
+comment_type: Any
+
+class DocumentType:
+    name: Any
+    publicId: Any
+    systemId: Any
+    def __init__(self, name, publicId, systemId) -> None: ...
+
+class Document:
+    def __init__(self) -> None: ...
+    def appendChild(self, element) -> None: ...
+    childNodes: Any
+
+def testSerializer(element): ...
+def tostring(element): ...
+
+class TreeBuilder(base.TreeBuilder):
+    documentClass: Any
+    doctypeClass: Any
+    elementClass: Any
+    commentClass: Any
+    fragmentClass: Any
+    implementation: Any
+    namespaceHTMLElements: Any
+    def __init__(self, namespaceHTMLElements, fullTree: bool = ...): ...
+    insertComment: Any
+    initial_comments: Any
+    doctype: Any
+    def reset(self) -> None: ...
+    def testSerializer(self, element): ...
+    def getDocument(self): ...
+    def getFragment(self): ...
+    def insertDoctype(self, token) -> None: ...
+    def insertCommentInitial(self, data, parent: Any | None = ...) -> None: ...
+    def insertCommentMain(self, data, parent: Any | None = ...) -> None: ...
+    document: Any
+    def insertRoot(self, token) -> None: ...
diff --git a/stubs/html5lib/html5lib/treewalkers/__init__.pyi b/stubs/html5lib/html5lib/treewalkers/__init__.pyi
new file mode 100644
index 000000000..eb1e26e94
--- /dev/null
+++ b/stubs/html5lib/html5lib/treewalkers/__init__.pyi
@@ -0,0 +1,4 @@
+from typing import Any
+
+def getTreeWalker(treeType, implementation: Any | None = ..., **kwargs): ...
+def pprint(walker): ...
diff --git a/stubs/html5lib/html5lib/treewalkers/base.pyi b/stubs/html5lib/html5lib/treewalkers/base.pyi
new file mode 100644
index 000000000..34eee4b3e
--- /dev/null
+++ b/stubs/html5lib/html5lib/treewalkers/base.pyi
@@ -0,0 +1,30 @@
+from typing import Any
+
+DOCUMENT: Any
+DOCTYPE: Any
+TEXT: Any
+ELEMENT: Any
+COMMENT: Any
+ENTITY: Any
+UNKNOWN: str
+
+class TreeWalker:
+    tree: Any
+    def __init__(self, tree) -> None: ...
+    def __iter__(self): ...
+    def error(self, msg): ...
+    def emptyTag(self, namespace, name, attrs, hasChildren: bool = ...) -> None: ...
+    def startTag(self, namespace, name, attrs): ...
+    def endTag(self, namespace, name): ...
+    def text(self, data) -> None: ...
+    def comment(self, data): ...
+    def doctype(self, name, publicId: Any | None = ..., systemId: Any | None = ...): ...
+    def entity(self, name): ...
+    def unknown(self, nodeType): ...
+
+class NonRecursiveTreeWalker(TreeWalker):
+    def getNodeDetails(self, node) -> None: ...
+    def getFirstChild(self, node) -> None: ...
+    def getNextSibling(self, node) -> None: ...
+    def getParentNode(self, node) -> None: ...
+    def __iter__(self): ...
diff --git a/stubs/html5lib/html5lib/treewalkers/dom.pyi b/stubs/html5lib/html5lib/treewalkers/dom.pyi
new file mode 100644
index 000000000..72a71d00a
--- /dev/null
+++ b/stubs/html5lib/html5lib/treewalkers/dom.pyi
@@ -0,0 +1,7 @@
+from .base import NonRecursiveTreeWalker
+
+class TreeWalker(NonRecursiveTreeWalker):
+    def getNodeDetails(self, node): ...
+    def getFirstChild(self, node): ...
+    def getNextSibling(self, node): ...
+    def getParentNode(self, node): ...
diff --git a/stubs/html5lib/html5lib/treewalkers/etree.pyi b/stubs/html5lib/html5lib/treewalkers/etree.pyi
new file mode 100644
index 000000000..33f6d8002
--- /dev/null
+++ b/stubs/html5lib/html5lib/treewalkers/etree.pyi
@@ -0,0 +1,7 @@
+from typing import Any
+
+tag_regexp: Any
+
+def getETreeBuilder(ElementTreeImplementation): ...
+
+getETreeModule: Any
diff --git a/stubs/html5lib/html5lib/treewalkers/etree_lxml.pyi b/stubs/html5lib/html5lib/treewalkers/etree_lxml.pyi
new file mode 100644
index 000000000..c9fb06cee
--- /dev/null
+++ b/stubs/html5lib/html5lib/treewalkers/etree_lxml.pyi
@@ -0,0 +1,54 @@
+from typing import Any
+
+from .base import NonRecursiveTreeWalker
+
+def ensure_str(s): ...
+
+class Root:
+    elementtree: Any
+    children: Any
+    text: Any
+    tail: Any
+    def __init__(self, et) -> None: ...
+    def __getitem__(self, key): ...
+    def getnext(self) -> None: ...
+    def __len__(self): ...
+
+class Doctype:
+    root_node: Any
+    name: Any
+    public_id: Any
+    system_id: Any
+    text: Any
+    tail: Any
+    def __init__(self, root_node, name, public_id, system_id) -> None: ...
+    def getnext(self): ...
+
+class FragmentRoot(Root):
+    children: Any
+    text: Any
+    def __init__(self, children) -> None: ...
+    def getnext(self) -> None: ...
+
+class FragmentWrapper:
+    root_node: Any
+    obj: Any
+    text: Any
+    tail: Any
+    def __init__(self, fragment_root, obj) -> None: ...
+    def __getattr__(self, name): ...
+    def getnext(self): ...
+    def __getitem__(self, key): ...
+    def __bool__(self): ...
+    def getparent(self) -> None: ...
+    def __unicode__(self): ...
+    def __len__(self): ...
+
+class TreeWalker(NonRecursiveTreeWalker):
+    fragmentChildren: Any
+    filter: Any
+    def __init__(self, tree) -> None: ...
+    def getNodeDetails(self, node): ...
+    def getFirstChild(self, node): ...
+    def getNextSibling(self, node): ...
+    def getParentNode(self, node): ...
diff --git a/stubs/html5lib/html5lib/treewalkers/genshi.pyi b/stubs/html5lib/html5lib/treewalkers/genshi.pyi
new file mode 100644
index 000000000..2e75daf20
--- /dev/null
+++ b/stubs/html5lib/html5lib/treewalkers/genshi.pyi
@@ -0,0 +1,5 @@
+from . import base
+
+class TreeWalker(base.TreeWalker):
+    def __iter__(self): ...
+    def tokens(self, event, next) -> None: ...