diff --git a/stubs/tinycss2/METADATA.toml b/stubs/tinycss2/METADATA.toml
new file mode 100644
index 000000000000..fe09240a6401
--- /dev/null
+++ b/stubs/tinycss2/METADATA.toml
@@ -0,0 +1,3 @@
+version = "1.5.1"
+upstream-repository = "https://github.com/Kozea/tinycss2"
+dependencies = ["types-webencodings"]
diff --git a/stubs/tinycss2/tinycss2/__init__.pyi b/stubs/tinycss2/tinycss2/__init__.pyi
new file mode 100644
index 000000000000..ea57523496f3
--- /dev/null
+++ b/stubs/tinycss2/tinycss2/__init__.pyi
@@ -0,0 +1,17 @@
+from typing import Final
+
+from .bytes import parse_stylesheet_bytes as parse_stylesheet_bytes
+from .parser import (
+    parse_blocks_contents as parse_blocks_contents,
+    parse_declaration_list as parse_declaration_list,
+    parse_one_component_value as parse_one_component_value,
+    parse_one_declaration as parse_one_declaration,
+    parse_one_rule as parse_one_rule,
+    parse_rule_list as parse_rule_list,
+    parse_stylesheet as parse_stylesheet,
+)
+from .serializer import serialize as serialize, serialize_identifier as serialize_identifier
+from .tokenizer import parse_component_value_list as parse_component_value_list
+
+__version__: Final[str]
+VERSION: Final[str]
diff --git a/stubs/tinycss2/tinycss2/ast.pyi b/stubs/tinycss2/tinycss2/ast.pyi
new file mode 100644
index 000000000000..3390a86fcb78
--- /dev/null
+++ b/stubs/tinycss2/tinycss2/ast.pyi
@@ -0,0 +1,160 @@
+from typing import Literal
+
+class Node:
+    source_line: int
+    source_column: int
+    type: str
+
+    def __init__(self, source_line: int, source_column: int) -> None: ...
+    def serialize(self) -> str: ...
+
+class ParseError(Node):
+    type: Literal["error"]
+    kind: str
+    message: str
+    repr_format: str
+    def __init__(self, line: int, column: int, kind: str, message: str) -> None: ...
+
+class Comment(Node):
+    type: Literal["comment"]
+    value: str
+    repr_format: str
+    def __init__(self, line: int, column: int, value: str) -> None: ...
+
+class WhitespaceToken(Node):
+    type: Literal["whitespace"]
+    value: str
+    repr_format: str
+    def __init__(self, line: int, column: int, value: str) -> None: ...
+
+class LiteralToken(Node):
+    type: Literal["literal"]
+    value: str
+    repr_format: str
+    def __init__(self, line: int, column: int, value: str) -> None: ...
+    def __eq__(self, other: object) -> bool: ...
+    def __ne__(self, other: object) -> bool: ...
+
+class IdentToken(Node):
+    type: Literal["ident"]
+    value: str
+    lower_value: str
+    repr_format: str
+    def __init__(self, line: int, column: int, value: str) -> None: ...
+
+class AtKeywordToken(Node):
+    type: Literal["at-keyword"]
+    value: str
+    lower_value: str
+    repr_format: str
+    def __init__(self, line: int, column: int, value: str) -> None: ...
+
+class HashToken(Node):
+    type: Literal["hash"]
+    value: str
+    is_identifier: bool
+    repr_format: str
+    def __init__(self, line: int, column: int, value: str, is_identifier: bool) -> None: ...
+
+class StringToken(Node):
+    type: Literal["string"]
+    value: str
+    representation: str
+    repr_format: str
+    def __init__(self, line: int, column: int, value: str, representation: str) -> None: ...
+
+class URLToken(Node):
+    type: Literal["url"]
+    value: str
+    representation: str
+    repr_format: str
+    def __init__(self, line: int, column: int, value: str, representation: str) -> None: ...
+
+class UnicodeRangeToken(Node):
+    type: Literal["unicode-range"]
+    start: int
+    end: int
+    repr_format: str
+    def __init__(self, line: int, column: int, start: int, end: int) -> None: ...
+
+class NumberToken(Node):
+    type: Literal["number"]
+    value: float
+    int_value: int | None
+    is_integer: bool
+    representation: str
+    repr_format: str
+    def __init__(self, line: int, column: int, value: float, int_value: int | None, representation: str) -> None: ...
+
+class PercentageToken(Node):
+    type: Literal["percentage"]
+    value: float
+    int_value: int | None
+    is_integer: bool
+    representation: str
+    repr_format: str
+    def __init__(self, line: int, column: int, value: float, int_value: int | None, representation: str) -> None: ...
+
+class DimensionToken(Node):
+    type: Literal["dimension"]
+    value: float
+    int_value: int | None
+    is_integer: bool
+    representation: str
+    unit: str
+    lower_unit: str
+    repr_format: str
+    def __init__(self, line: int, column: int, value: float, int_value: int | None, representation: str, unit: str) -> None: ...
+
+class ParenthesesBlock(Node):
+    type: Literal["() block"]
+    content: list[Node]
+    repr_format: str
+    def __init__(self, line: int, column: int, content: list[Node]) -> None: ...
+
+class SquareBracketsBlock(Node):
+    type: Literal["[] block"]
+    content: list[Node]
+    repr_format: str
+    def __init__(self, line: int, column: int, content: list[Node]) -> None: ...
+
+class CurlyBracketsBlock(Node):
+    type: Literal["{} block"]
+    content: list[Node]
+    repr_format: str
+    def __init__(self, line: int, column: int, content: list[Node]) -> None: ...
+
+class FunctionBlock(Node):
+    type: Literal["function"]
+    name: str
+    lower_name: str
+    arguments: list[Node]
+    repr_format: str
+    def __init__(self, line: int, column: int, name: str, arguments: list[Node]) -> None: ...
+
+class Declaration(Node):
+    type: Literal["declaration"]
+    name: str
+    lower_name: str
+    value: list[Node]
+    important: bool
+    repr_format: str
+    def __init__(self, line: int, column: int, name: str, lower_name: str, value: list[Node], important: bool) -> None: ...
+
+class QualifiedRule(Node):
+    type: Literal["qualified-rule"]
+    prelude: list[Node]
+    content: list[Node]
+    repr_format: str
+    def __init__(self, line: int, column: int, prelude: list[Node], content: list[Node]) -> None: ...
+
+class AtRule(Node):
+    type: Literal["at-rule"]
+    at_keyword: str
+    lower_at_keyword: str
+    prelude: list[Node]
+    content: list[Node] | None
+    repr_format: str
+    def __init__(
+        self, line: int, column: int, at_keyword: str, lower_at_keyword: str, prelude: list[Node], content: list[Node] | None
+    ) -> None: ...
diff --git a/stubs/tinycss2/tinycss2/bytes.pyi b/stubs/tinycss2/tinycss2/bytes.pyi
new file mode 100644
index 000000000000..24687b7f2711
--- /dev/null
+++ b/stubs/tinycss2/tinycss2/bytes.pyi
@@ -0,0 +1,14 @@
+from webencodings import Encoding
+
+from .ast import Node
+
+def decode_stylesheet_bytes(
+    css_bytes: bytes, protocol_encoding: str | None = None, environment_encoding: Encoding | None = None
+) -> tuple[str, Encoding]: ...
+def parse_stylesheet_bytes(
+    css_bytes: bytes,
+    protocol_encoding: str | None = None,
+    environment_encoding: Encoding | None = None,
+    skip_comments: bool = False,
+    skip_whitespace: bool = False,
+) -> tuple[list[Node], Encoding]: ...
diff --git a/stubs/tinycss2/tinycss2/color3.pyi b/stubs/tinycss2/tinycss2/color3.pyi
new file mode 100644
index 000000000000..664acf304a11
--- /dev/null
+++ b/stubs/tinycss2/tinycss2/color3.pyi
@@ -0,0 +1,12 @@
+from collections.abc import Iterable
+from typing import NamedTuple
+
+from .ast import Node
+
+class RGBA(NamedTuple):
+    red: float
+    green: float
+    blue: float
+    alpha: float
+
+def parse_color(input: str | Iterable[Node]) -> str | RGBA | None: ...
diff --git a/stubs/tinycss2/tinycss2/color4.pyi b/stubs/tinycss2/tinycss2/color4.pyi
new file mode 100644
index 000000000000..d393e156e295
--- /dev/null
+++ b/stubs/tinycss2/tinycss2/color4.pyi
@@ -0,0 +1,19 @@
+from collections.abc import Iterable, Iterator
+from typing import Literal
+
+from .ast import Node
+
+class Color:
+    COLOR_SPACES: set[str] | None
+    def __init__(self, space: str, coordinates: tuple[float | None, ...], alpha: float) -> None: ...
+    def __iter__(self) -> Iterator[float | None]: ...
+    def __getitem__(self, key: int) -> float: ...
+    def __hash__(self) -> int: ...
+    def __eq__(self, other: object) -> bool: ...
+    def to(self, space: str) -> Color: ...
+
+def parse_color(input: str | Iterable[Node]) -> Color | Literal["currentcolor"] | None: ...
+
+COLOR_SPACES: set[str]
+D50: tuple[float, float, float]
+D65: tuple[float, float, float]
diff --git a/stubs/tinycss2/tinycss2/color5.pyi b/stubs/tinycss2/tinycss2/color5.pyi
new file mode 100644
index 000000000000..03246e07e6e9
--- /dev/null
+++ b/stubs/tinycss2/tinycss2/color5.pyi
@@ -0,0 +1,17 @@
+from collections.abc import Iterable
+from typing import Literal
+
+from . import color4
+from .ast import Node
+
+COLOR_SCHEMES: set[str]
+COLOR_SPACES: set[str]
+D50: tuple[float, float, float]
+D65: tuple[float, float, float]
+
+class Color(color4.Color):
+    COLOR_SPACES: set[str] | None
+
+def parse_color(
+    input: str | Iterable[Node], color_schemes: Literal["normal"] | Iterable[str] | None = None
+) -> color4.Color | Color | Literal["currentcolor"] | None: ...
diff --git a/stubs/tinycss2/tinycss2/nth.pyi b/stubs/tinycss2/tinycss2/nth.pyi
new file mode 100644
index 000000000000..6a0aa906cb70
--- /dev/null
+++ b/stubs/tinycss2/tinycss2/nth.pyi
@@ -0,0 +1,11 @@
+from collections.abc import Iterable
+from re import Pattern
+
+from .ast import Node
+
+def parse_nth(input: str | Iterable[Node]) -> tuple[int, int] | None: ...
+def parse_b(tokens: Iterable[Node], a: int) -> tuple[int, int] | None: ...
+def parse_signless_b(tokens: Iterable[Node], a: int, b_sign: int) -> tuple[int, int] | None: ...
+def parse_end(tokens: Iterable[Node], a: int, b: int) -> tuple[int, int] | None: ...
+
+N_DASH_DIGITS_RE: Pattern[str]
diff --git a/stubs/tinycss2/tinycss2/parser.pyi b/stubs/tinycss2/tinycss2/parser.pyi
new file mode 100644
index 000000000000..6b8ebae7dd64
--- /dev/null
+++ b/stubs/tinycss2/tinycss2/parser.pyi
@@ -0,0 +1,18 @@
+from collections.abc import Iterable
+from typing import TypeAlias
+
+from .ast import AtRule, Comment, Declaration, Node, ParseError, QualifiedRule, WhitespaceToken
+
+_Rule: TypeAlias = QualifiedRule | AtRule | Comment | WhitespaceToken | ParseError
+
+def parse_one_component_value(input: str | Iterable[Node], skip_comments: bool = False) -> Node: ...
+def parse_one_declaration(input: str | Iterable[Node], skip_comments: bool = False) -> Declaration | ParseError: ...
+def parse_blocks_contents(
+    input: str | Iterable[Node], skip_comments: bool = False, skip_whitespace: bool = False
+) -> list[Declaration | AtRule | QualifiedRule | Comment | WhitespaceToken | ParseError]: ...
+def parse_declaration_list(
+    input: str | Iterable[Node], skip_comments: bool = False, skip_whitespace: bool = False
+) -> list[Declaration | AtRule | Comment | WhitespaceToken | ParseError]: ...
+def parse_one_rule(input: str | Iterable[Node], skip_comments: bool = False) -> QualifiedRule | AtRule | ParseError: ...
+def parse_rule_list(input: str | Iterable[Node], skip_comments: bool = False, skip_whitespace: bool = False) -> list[_Rule]: ...
+def parse_stylesheet(input: str | Iterable[Node], skip_comments: bool = False, skip_whitespace: bool = False) -> list[_Rule]: ...
diff --git a/stubs/tinycss2/tinycss2/serializer.pyi b/stubs/tinycss2/tinycss2/serializer.pyi
new file mode 100644
index 000000000000..9ea5c7458855
--- /dev/null
+++ b/stubs/tinycss2/tinycss2/serializer.pyi
@@ -0,0 +1,11 @@
+from collections.abc import Iterable
+
+from .ast import Node
+
+def serialize(nodes: Iterable[Node]) -> str: ...
+def serialize_identifier(value: str) -> str: ...
+def serialize_name(value: str) -> str: ...
+def serialize_string_value(value: str) -> str: ...
+def serialize_url(value: str) -> str: ...
+
+BAD_PAIRS: set[tuple[str, str]]
diff --git a/stubs/tinycss2/tinycss2/tokenizer.pyi b/stubs/tinycss2/tinycss2/tokenizer.pyi
new file mode 100644
index 000000000000..52e27c7480c6
--- /dev/null
+++ b/stubs/tinycss2/tinycss2/tokenizer.pyi
@@ -0,0 +1,3 @@
+from .ast import Node
+
+def parse_component_value_list(css: str, skip_comments: bool = False) -> list[Node]: ...