Update dependency AngleSharp.Css to 0.18.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
AngleSharp.Css (source)	0.17.0 → 0.18.0

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Release Notes

AngleSharp/AngleSharp.Css (AngleSharp.Css)

v0.18.0

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

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