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diff --git a/third_party/rust/cssparser/src/lib.rs b/third_party/rust/cssparser/src/lib.rs
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#![crate_name = "cssparser"]
+#![crate_type = "rlib"]
+#![cfg_attr(feature = "bench", feature(test))]
+#![deny(missing_docs)]
+
+/*!
+
+Implementation of [CSS Syntax Module Level 3](https://drafts.csswg.org/css-syntax/) for Rust.
+
+# Input
+
+Everything is based on `Parser` objects, which borrow a `&str` input.
+If you have bytes (from a file, the network, or something)
+and want to support character encodings other than UTF-8,
+see the `stylesheet_encoding` function,
+which can be used together with rust-encoding or encoding-rs.
+
+# Conventions for parsing functions
+
+* Take (at least) a `input: &mut cssparser::Parser` parameter
+* Return `Result<_, ()>`
+* When returning `Ok(_)`,
+  the function must have consumed exactly the amount of input that represents the parsed value.
+* When returning `Err(())`, any amount of input may have been consumed.
+
+As a consequence, when calling another parsing function, either:
+
+* Any `Err(())` return value must be propagated.
+  This happens by definition for tail calls,
+  and can otherwise be done with the `?` operator.
+* Or the call must be wrapped in a `Parser::try` call.
+  `try` takes a closure that takes a `Parser` and returns a `Result`,
+  calls it once,
+  and returns itself that same result.
+  If the result is `Err`,
+  it restores the position inside the input to the one saved before calling the closure.
+
+Examples:
+
+```{rust,ignore}
+// 'none' | <image>
+fn parse_background_image(context: &ParserContext, input: &mut Parser)
+                                    -> Result<Option<Image>, ()> {
+    if input.try_parse(|input| input.expect_ident_matching("none")).is_ok() {
+        Ok(None)
+    } else {
+        Image::parse(context, input).map(Some)  // tail call
+    }
+}
+```
+
+```{rust,ignore}
+// [ <length> | <percentage> ] [ <length> | <percentage> ]?
+fn parse_border_spacing(_context: &ParserContext, input: &mut Parser)
+                          -> Result<(LengthOrPercentage, LengthOrPercentage), ()> {
+    let first = LengthOrPercentage::parse?;
+    let second = input.try_parse(LengthOrPercentage::parse).unwrap_or(first);
+    (first, second)
+}
+```
+
+*/
+
+#![recursion_limit = "200"] // For color::parse_color_keyword
+
+pub use crate::color::{
+    hsl_to_rgb, hwb_to_rgb, parse_color_keyword, AngleOrNumber, Color, ColorComponentParser,
+    NumberOrPercentage, RGBA,
+};
+pub use crate::cow_rc_str::CowRcStr;
+pub use crate::from_bytes::{stylesheet_encoding, EncodingSupport};
+#[doc(hidden)]
+pub use crate::macros::_cssparser_internal_to_lowercase;
+pub use crate::nth::parse_nth;
+pub use crate::parser::{BasicParseError, BasicParseErrorKind, ParseError, ParseErrorKind};
+pub use crate::parser::{Delimiter, Delimiters, Parser, ParserInput, ParserState};
+pub use crate::rules_and_declarations::{parse_important, parse_one_declaration};
+pub use crate::rules_and_declarations::{parse_one_rule, RuleListParser};
+pub use crate::rules_and_declarations::{AtRuleParser, QualifiedRuleParser};
+pub use crate::rules_and_declarations::{DeclarationListParser, DeclarationParser};
+pub use crate::serializer::{serialize_identifier, serialize_name, serialize_string};
+pub use crate::serializer::{CssStringWriter, ToCss, TokenSerializationType};
+pub use crate::tokenizer::{SourceLocation, SourcePosition, Token};
+pub use crate::unicode_range::UnicodeRange;
+pub use cssparser_macros::*;
+#[doc(hidden)]
+pub use phf as _cssparser_internal_phf;
+
+#[macro_use]
+mod macros;
+
+mod rules_and_declarations;
+
+#[cfg(feature = "dummy_match_byte")]
+mod tokenizer;
+
+#[cfg(not(feature = "dummy_match_byte"))]
+mod tokenizer {
+    include!(concat!(env!("OUT_DIR"), "/tokenizer.rs"));
+}
+mod color;
+mod cow_rc_str;
+mod from_bytes;
+mod nth;
+mod parser;
+mod serializer;
+mod unicode_range;
+
+#[cfg(test)]
+mod size_of_tests;
+#[cfg(test)]
+mod tests;