Released on Saturday, September 12 2026

• Improved pseudo-class matching to skip a per-element ConditionalWeakTable probe when no state has ever been forced via SetPseudoClass

Released on Friday, September 11 2026

• Fixed issue with calculation of CSS grid style
• Fixed default value of CSS gradients
• Fixed issue with Point2D style computations
• Fixed issue with style computation of border-image-slice declarations
• Fixed handling of ::before and ::after w.r.t. content declarations
• Added support for more text-overflow keywords
• Added alignment-baseline declaration
• Added baseline-shift declaration
• Added color-interpolation-filters declaration
• Added clip-path and clip-rule declarations
• Added dominant-baseline declaration
• Added fill-opacity and fill-rule declarations
• Added marker-start, marker-mid, and marker-end declarations
• Added mask declaration
• Added text-underline-position declaration
• Added writing-mode declaration

Released on Wednesday, September 9 2026

• Fixed unresolved converter re-entry (#243) @sebastienros
• Fixed issue with computation of transform functions
• Fixed computed animation longhands retaining unresolved initial values
• Fixed percentage border-radius components resolving against the wrong axis
• Fixed default list styling for unordered lists
• Added shorthand decomposition and clip support for overflow
• Added explicit pseudo class handling via SetPseudoClass
• Added support for parsing filter declarations

Released on Saturday, September 5 2026

• Improved evaluation of comma-separated media queries (#230)
• Fixed wrong media feature used for scripting (#233)
• Fixed wrong rientation and scan evaluation (#232)
• Fixed not <known media type> is always false (#231)
• Fixed calc() computations in AoT-compiled applications (#236) @sebastienros
• Fixed usage of calc() with unitless scaling (multiplication / division)
• Fixed case-sensitive matching of and / or in @supports and from / to in @keyframes (#240) @meziantou
• Fixed operator associativity and result units in calc() (#239) @meziantou
• Fixed unquoted and invalid url() handling (#238) @meziantou
• Fixed handling of invalid keyframe selectors
• Fixed stackoverflow due to cyclic CSS variables (#241)
• Added optional CSSOM compliant color seralization (#229) @lahma
• Added user-preference media features to the render device (#235) @lahma
• Added media query list evaluation using IRenderDevice (#228) @lahma

Released on Friday, August 21 2026.

• Fixed oklab/oklch usage with plain number as first argument (#225) @scasteran-jw

Released on Friday, July 31 2026.

• Fixed NRE in mask-image with gradients (#218)
• Improved cascade resolution performance (#220) @lahma

Released on Sunday, July 26 2026.

• First stable version

Released on Saturday, July 25 2026.

• Updated to use AngleSharp minimum version of 1.5 (#150)
• Updated media parsing to media L4 spec (#133)
• Updated naming of CSS values (e.g., Color to CssColorValue)
• Fixed issue when updating shorthands with invalid values (#129)
• Fixed issue with appended EOF character in CssText (#123)
• Fixed missing semicolon in @page rule (#135)
• Fixed integer serialization of keyframe stops (#128)
• Fixed ordering of rows and columns in grid and grid-gap (#137)
• Fixed inclusion of CSS from stylesheets (#116, #140)
• Fixed style empty if text-align is start (#151)
• Fixed computation of priority in CSS rules using multi selector
• Fixed GetInnerText multi-line / text node behavior (#155) @Seyden
• Fixed computation of relative (em) values to absolute (px) for Length (#136)
• Added further compactification of CSS tuples (#89, #93)
• Added new value types CssPercentageValue, CssNumberValue, and CssIntegerValue
• Added support for CSS nesting in style rules (#148)
• Added resolution of CSS variable names (#62)
• Added support for 8-digit hex color codes (#132)
• Added support for margin-block and margin-inline declarations
• Added support for padding-block and padding-inline declarations
• Added missing box model declarations (e.g., aspect-ratio, block-size, overflow-clip-margin)
• Added missing logical declarations (e.g., inset, border-inline, border-end-start-radius)
• Added missing alignment declarations (e.g., justify-items, place-content)
• Added missing animations declarations (e.g., animation-composition, animation-delay-start)
• Added missing scroll declarations (e.g., scroll-behavior, overscroll-behavior)
• Added missing fonts declarations (e.g., font-display, font-palette, font-synthesis)
• Added missing color declarations (e.g., color-scheme, accent-color)
• Added missing compositing declarations (e.g., backdrop-filter, isolation)
• Added missing shape declarations (e.g., shape-outside, shape-rendering)
• Added missing anchor positioning declarations (e.g., anchor-name, anchor-scope, position-anchor)
• Added missing text declarations (e.g., text-underline-offset, tab-size, initial-letter)
• Added missing masking declarations (e.g., mask-image, mask-border-source)
• Added missing auxiliary declarations (e.g., counter-set, image-rendering, view-transition-name)
• Added missing containment declarations (e.g., contain, will-change)
• Added more CSSOM possibilities and helpers (#6)
• Added more rules such as @view-transition or @layer
• Added parts of recent color spec update such as rgb with spaces (#131)
• Added now Color L4 parsing with hsl, hwb, lab, lch, oklab, and oklch
• Added support for recent CSS list-type values (#152)
• Added option to preserve comments in CSS stylesheet (#99)
• Added support for CSS container queries

Released on Sunday, January 15 2023.

• Updated build system to use NUKE instead of CAKE
• Dropped .NET Framework 4.6
• Updated to use AngleSharp 0.17
• Updated micro parser API to be public (#111)
• Fixed casing issue with color, timing, and gradient functions (#109)
• Fixed parsing of skew (#101)
• Fixed shorthand properties using inherit being omitted (#100)
• Added support for @counter-style (#102)
• Added support for @font-feature-values (#102)
• Added support for conic-gradient (#101)
• Added support for scroll-snap-type declaration (#91)

Released on Tuesday, February 15 2022.

• Fixed issue with wrong AngleSharp version used for build (#103)

Released on Wednesday, January 5 2022.

• Fixed issue with text-shadow missing the color part (#97)
• Fixed support for IsToleratingInvalidSelectors parser option (#98)
• Added Color.UseHex to change color output format (#96)

Released on Thursday, November 4 2021.

• Fixed issue with unbalanced grid areas and rows (#82)
• Fixed small numbers to be transformed into negative exponentials (#80)
• Fixed issue handling exponential unit values (#79)
• Fixed InvalidCastException in template merging with CSS variables (#83)

Released on Wednesday, August 11 2021.

• Fixed issue with certain letter combinations in data URIs (#76)
• Added support for xxx-large keyword in font-size (#77)

Released on Sunday, June 13 2021.

• Updated to use AngleSharp 0.16

Release on Sunday, June 6 2021.

• Extended values for the width declaration (#69)

Released on Thursday, April 22 2021.

• Added fill declaration (#59)
• Added support for legacy linear-gradient syntax (#66)
• Fixed parsing of background: none (#65)
• Fixed issues with brackets being removed for calc expressions (#67)
• Fixed issue throwing in grid-template: none serializations (#63, #68)
• Dropped support for the .NET Standard 1.3 target

Released on Thursday, June 11 2020.

• Fixed issue for representation of counter() and counters() (#58)
• Fixed parsing of numerical font-weight in font shorthand (#57)

Released on Monday, May 4 2020.

• Updated ComputeDeclarations and ComputeCascadedStyle to support IEnumerable<ICssStyleRule> (#53)

Released on Tuesday, April 7 2020.

• Added a way to compute relative dimensions (#3)
• Added render tree information incl. utilities (#4)
• Fixed issue with empty content (#42)
• Added debugger display attribute to CSS rules (#43)
• Fixed handling of CSS gradients (#45)
• Improved CSS string representation of gradients (#46)
• Exposed IStyleCollection for CSS info (#51)
• Fixed analysis issue with potential null selector (#52)
• Added support for the .NET Framework 4.6.1 target
• Added support for the .NET Framework 4.7.2 target

Released on Friday, September 6 2019.

• Added Compute extension for ICssStyleDeclaration
• Added GetMatchingStyles extension for ICssRuleList
• Added MinifyStyleFormatter
• Added Prettify and Minify extension methods
• Fixed border-style expansion order (#34)
• Fixed text-decoration expansion order (#35)
• Fixed missing whitespace in GetInnerText() (#32)

Released on Wednesday, May 15 2019.

• Binary version fix
• Fixed indexers are missing a DomAccessorAttribute (#30)
• Added cssRules alias: rules (#29)

Released on Sunday, May 12 2019.

• Reference latest AngleSharp
• Fixed empty value when removing properties (#14)
• Returns null in GetStyle if CSS not configured (#15)
• Added pointer-events and fixed border recombination (#16)
• Fixed stroke-width value without unit (#18)
• Fixed exception when not providing an IRenderDevice (#20)
• Fixed missing CssStylingService.Default in cascade (#21)
• Added extension helper SetStyle to modify all styles of many elements (#22)
• Fixed expansion of shorthand properties to longhand (#23)
• Opened CSSOM, e.g., declared ICssFunctionValue public (#24)
• Introduced special converter for the src declaration (#25)
• Fixed bug regarding CSS grid serialization (#27)
• Added DefaultRenderDevice implementation

Released on Monday, January 7 2019.

• Reference latest AngleSharp
• Updated reference to System.Encoding.CodePages (#13)

Released on Friday, January 4 2019.

• Initial release