css-inline

Added

• Pyodide 3.14 wheels for the pyemscripten_2026_0 platform. #786

Fixed

• file:// stylesheet URLs not percent-decoded and broken on Windows drive letters.

Fixed

• With keep_at_rules enabled, at-rules without a block (e.g. @import) lost their prelude and terminator, fusing with the following rule (@import@media ...) and producing a stylesheet browsers reject entirely.

Changed

• Bump MSRV to 1.85.
• Update selectors to 0.38.
• Update cssparser to 0.37.

Fixed

• width/height HTML attributes not derived from an element's own inline style attribute. #725

Fixed

• inline_fragment silently returning only whitespace when the input starts with whitespace or contains structural HTML tags (<html>, <head>, <body>, <style>). #692 #693

Changed

• Update html5ever to 0.39.
• Update selectors to 0.36.

Fixed

• !important lost when inlining styles onto elements with existing inline style attributes. #682
• !important lost when minify_css is enabled due to separator mismatch during property lookup. #682

Added

• InlineOptions::apply_width_attributes and InlineOptions::apply_height_attributes options to add dimension HTML attributes from CSS properties on supported elements (table, td, th, img). #652

Performance

• Skip selectors that reference non-existent classes, IDs, or tags.
• Faster HTML serialization for styles containing double quotes.

Changed

• Update html5ever to 0.38.
• Update selectors to 0.35.

Fixed

• Inline !important styles being overwritten by stylesheet !important styles. #637

Added

• InlineOptions::remove_inlined_selectors option to remove selectors that were successfully inlined from <style> blocks.

Changed

• Update cssparser to 0.36.
• Update html5ever to 0.36.
• Update selectors to 0.33.

Fixed

• CLI tests compatibility with future Cargo versions. #602

Performance

• Use element indexes for faster selector lookups on large documents.
• Use more efficient data structures for storing element styles.

Added

• minify_css option #12

Changed

• Bump MSRV to 1.80
• Update selectors to 0.32.

Added

• keepAtRules option to keep all "at-rules" (ones starting with @) inside a "style" element. #265

Performance

• Avoid unnecessary check for double quotes.
• Avoid creating an unnecessary string cache entry.
• Use a more precise estimate for the size of the number of applied styles.
• Avoid hashtable rebuilding on small hashmaps.

Added

• CLI: --extra-css-file option to load additional CSS from files. #67

Changed

• CLI: Remove pico-args
• Bump MSRV to 1.75.
• Update selectors to 0.30.
• Update html5ever to 0.35.

Fixed

• Ignored !important that has insignificant whitespace after it.

Performance

• Use interned string to compare style element name.
• Only check the value suffix for !important.

Changed

• Bump MSRV to 1.71.1.
• update cssparser to 0.35.
• update html5ever to 0.31.
• update selectors to 0.28.

Performance

• Slightly improve the performance of HTML serialization.
• Avoid creating unused caches.

Performance

• Slightly improve performance of HTML serialization.
• Avoid creating unused caches.

Fixed

• Prioritize !important rules when computing element styles. #398

Changed

• Bump MSRV to 1.70.

Fixed

• Replace double quotes when merging styles. #392

Fixed

• Precedence of element styles over other styles. #364

Added

• External stylesheet caching. #314
• Inlining to HTML fragments. #335

Changed

• Update html5ever to 0.27.
• Update rayon to 1.10.

Added

• A way to customize resolving remote stylesheets.
• Support for the data-css-inline="keep" attribute to enforce keeping the style tag.

Changed

• Replace attohttpc with reqwest to simplify implementing non-blocking stylesheet resolving in the future release.

Fixed

• Lookups for previous / next siblings, affecting selectors like nth-child. #324

Performance

• Avoid using binary search on attributes.

Changed

• Display stylesheet location in network-related errors.
• Implement std::error::Error::source for InlineError.

Performance

• Optimize serialization of attributes and text nodes.

Performance

• Avoid iterating over non-Element nodes.
• Reuse caches for nth index selectors.

Changed

• Update indexmap to 2.1.
• Update cssparser to 0.31.2.
• Update selectors to 0.25.
• Bump MSRV to 1.65.

Fixed

• Replace double quotes in all property values.

Performance

• Avoid allocation when replacing double quotes in property values.

Added

• The inline_style_tags option to control whether inlining from "style" tags should be performed. #253

Performance

• Reuse existing attributes when creating an element during parsing.

Changed

• Bump MSRV to 1.63.

Performance

• Pre-allocate space during serialization.
• Optimized class attribute handling: up to 25% faster for extensive class-dependent selectors.
• Fast-path class check for shorter class attribute values.
• Use a Bloom filter to detect if an element has no given class.
• Avoid allocating a vector during selectors compilation.
• Use FxHasher in more cases.

Changed

• Drop usage of memchr.
• Bump MSRV to 1.62.1.

Fixed

• Applying new styles only to the first matching tag during styles merging. #224

Performance

• Fix under-allocating storage for intermediate CSS styles.
• Perform CSS inlining as late as possible to avoid intermediate allocations. #220

Performance

• Optimized HTML serialization for a performance boost of up to 25%.

Changed

• Standardized the formatting of CSS declarations: now consistently using : separator between properties and values.

Performance

• Various performance improvements.

Performance

• Use a simpler way for HTML tree traversal.
• Avoid hashing in some cases.

Added

• keep_link_tags configuration option.

Changed

• Replace remove_style_tags with keep_style_tags.

Fixed

• SECURITY: Passing unescaped strings in attribute values introduced in #184. Previously, escaped values became unescaped on the serialization step.

Removed

• The inline_style_tags configuration option.

Fixed

• Serialize all HTML attributes without escaping. #184

Internal

• Replaced the kuchiki crate with our custom-built HTML tree representation. #176

Performance

• 30-50% average performance improvement due switch to a custom-built HTML tree representation and serializer.

Added

• --output-filename-prefix CLI option to control the output files prefix.
• Support for the file:// URI scheme in base_url. #171

Changed

• Return 1 exit code if any of the input files were not processed successfully via CLI.

Added

• data-css-inline="ignore" attribute to ignore CSS inlining. #10

Fixed

• Ignoring selectors' specificity when applying declarations from different qualified rules. #148

Added

• New http & file features which give a way to disable resolving external stylesheets and reduce the compiled artifacts size.

Fixed

• !important rules not overriding inlined styles. #152

Fixed

• Not respecting specificity in case of inlining overlapping rules like padding and padding-top. #142

Performance

• Pre-allocate more memory for output HTML to avoid resizing.

Added

• Separate InlineError::MissingStyleSheet error variant to improve debugging experience. #124

Fixed

• Invalid handling of double-quoted property values like in font-family: "Open Sans". #129

Performance

• Use std::fs::read_to_string in CLI to avoid over/under allocating of the input buffer.

Fixed

• Panic on invalid URLs for remote stylesheets.

Changed

• Update rayon to 1.5.

Performance

• Optimize loading of external files.

Performance

• Avoid allocations in error formatting.

Fixed

• Incorrect override of exiting style attribute values. #113

Performance

• Use specialized to_string implementation on &&str.
• Use ahash.

Fixed

• Ignored style tags when the document contains multiple of them and the remove_style_tags: true config option is used. #110

Fixed

• Ignored selectors specificity. #108

Fixed

• Compatibility with the new cssparser crate version.

Performance

• Avoid string allocations during converting ParseError to InlineError.

Changed

• Links to remote stylesheets are deduplicated now.

Fixed

• Wrong inlined file prefixes handling in CLI. #89

Performance

• Use Formatter.write_str instead of write! macro in the Display trait implementation for InlineError. #85
• Use Cow for error messages. #87

Added

• CSSInliner::options() that implements the Builder pattern. #71

Changed

• Restrict visibility of items in parser.rs

Performance

• Avoid string allocation in get_full_url

Added

• Option to disable processing of "style" tags. #45
• Option to inline additional CSS. #45

Changed

• Switch from openssl to rustls in attohttpc dependency. #49

Performance

• Use codegen-units=1 and lto=fat.
• Reduce the number of allocations in CLI.
• Avoid CLI output formatting when it is not needed.

Changed

• Remove debug symbols from the release build

Performance

• Reduce the number of String allocations.
• Avoid BTreeMap::insert when style attribute already exists

Changed

• Fix links in docs

Added

• Command Line Interface. #33

Added

• CSSInliner and customization options. #9
• Option to remove "style" tags (remove_style_tags). Disabled by default. #11
• CSSInliner::compact() constructor for producing smaller HTML output.
• CSSInliner.inline_to that writes the output to a generic writer. #24
• Implement Error for InlineError.
• Loading external stylesheets. #8
• Option to control whether remote stylesheets should be loaded (load_remote_stylesheets). Enabled by default.

Changed

• Improved error messages. #27
• Skip selectors that can't be parsed.

Fixed

• Ignore @media queries since they can not be inlined. #7
• Panic in cases when styles are applied to the currently processed "link" tags.

Performance

• Improve performance for merging new styles in existing "style" attributes.

• Initial public release