CSS properties

distribute is a compatibility value for inter-character. Under justify alignment, it affects how spaces or inter-character gaps expand.

The current property registry and StyleCore/Extras have no implementation that uses this element property. Tokenizer acceptance of its name, inclusion in the @supports allowlist, or the existence of imported tests does not establish support.

Accepts a single clip or ellipsis value. Two-sided syntax, custom strings and fade are not implemented. Ellipsis also depends on the actual overflow, nowrap and width conditions.

The built-in registry, logical mapping, declaration expansion, and apply dispatch currently provide no implementation path that uses this property. Its appearance in examples, storage in CSSOM, or support for the corresponding standard property does not prove this name takes effect.

Multiple layers with offset-x, offset-y and blur; lengths can use calc/min/max/clamp. The default color is currentColor.

Uses a punctuation table and fixed half-em trimming. Paths exist for paragraph starts, adjacent punctuation, and per-line trim-start. Runs with nonzero letter-spacing are skipped in the first pass. Behavior across runs and font glyph faces does not provide complete OpenType punctuation compression.

Uses Unicode case conversion and ICU locale paths, with language obtained from lang. Newer values such as full-width/full-size-kana/math-auto are not implemented.

auto is distinct from an explicit 0. Percentages are relative to 1em.

Only these two values are accepted. under, left, right and their combinations are not implemented.

The current property registry and StyleCore/Extras have no implementation that uses this element property. Tokenizer acceptance of its name, inclusion in the @supports allowlist, or the existence of imported tests does not establish support.

The current property registry and StyleCore/Extras have no implementation that uses this element property. Tokenizer acceptance of its name, inclusion in the @supports allowlist, or the existence of imported tests does not establish support.

The current property registry and StyleCore/Extras have no implementation that uses this element property. Tokenizer acceptance of its name, inclusion in the @supports allowlist, or the existence of imported tests does not establish support.

Percentages are resolved during layout. Affine calc expressions retain px and percentage terms; non-affine expressions are converted to numbers during style resolution, so a complete container reference cannot be claimed for every function.

The 2D and 4x4 matrix paths are available. General intersection sorting of 3D planes is not fully implemented. calc() in transform arguments is outside the number scanner; unknown units use the original numeric value. This is not complete value syntax support.

SVG fill-box, stroke-box and view-box are not implemented.

Supports percentages and the Z component; values are evaluated against the transform reference box.

Implements 3D matrices, depth sorting of direct planes and limited splitting of leaf-node planes. The code explicitly falls back for complex descendants, effects and perspective scenarios; this is not complete browser 3D context sorting.

Supports multiple transitions in the shorthand, s/ms, cubic-bezier(), steps(), and step-*; only properties that can be written back and interpolated work. The all keyword does not mean every property can be animated.

Updates only the first TransitionDef; comma-separated time lists are not implemented item by item.

Updates only the first TransitionDef; comma-separated time lists are not implemented item by item.

Writes only the property string of the first definition; a separate comma-separated property list is not expanded.

The longhand accepts only keywords and updates the first definition; easing functions can be set through the transition shorthand.

Individual properties compose in the order translate, rotate, scale, transform. The helper only handles numeric prefixes and percentages; it does not convert lengths such as em/rem or parse calc.

Embedding and isolation are applied by injecting control characters. plaintext affects the paragraph base direction.

Supports CSS-wide keywords. Explicit inherit takes the parent computed value; revert rolls back the current origin; revert-layer rolls back the current layer, with inline declarations handled separately. CSS-wide keywords introduced through variable substitution may not cover all static layer semantics.

Image sources are parsed separately in background(-image), border-image-source, list-style-image, content, mask-image and other contexts, then loaded through the image cache. Actual formats, network loading and path resolution depend on the context and build. SVG images depend on KUI_SVG_BACKEND; url() alone does not imply support for SVG filter or clipping references.

With the default auto value, KUI text is not selectable; text or all must be set explicitly. Currently, all and text both establish a selectable root; atomic select-all behavior was not found.

Token-level substitution supports fallback, nesting, arguments inside functions, empty fallback, and cycle/depth guards. Without a valid substitution the declaration is invalid at computed-value time (IACVT).

Used by the corresponding inline-box and table paths. Percentages are relative to the element's own line-height. sub/super positioning uses the implemented font proportions.

Usable only in properties that accept the value type. The consuming property determines the percentage basis. Physical units use 96 CSS px/in.

visible and hidden control painting and hit testing. collapse has collapse paths for table rows and columns and for flex items; other boxes are hidden while retaining their space.

Usable only in properties that accept the value type. The consuming property determines the percentage basis. Physical units use 96 CSS px/in.

Usable only in properties that accept the value type. The consuming property determines the percentage basis. Physical units use 96 CSS px/in.

Usable only in properties that accept the value type. The consuming property determines the percentage basis. Physical units use 96 CSS px/in.

Implements the six classic values. Does not implement the modern combined white-space-collapse/text-wrap-mode syntax or their separate longhands.

The current property registry and StyleCore/Extras have no implementation that uses this element property. Tokenizer acceptance of its name, inclusion in the @supports allowlist, or the existence of imported tests does not establish support.

The built-in registry, logical mapping, declaration expansion, and apply dispatch currently provide no implementation path that uses this property. Its appearance in examples, storage in CSSOM, or support for the corresponding standard property does not prove this name takes effect.

Lengths, percentages, and math trees are stored separately. Percentage resolution depends on whether the containing block size is definite or indefinite. Intrinsic sizing uses IntrinsicSizer, with separate constraints for replaced elements, flex, grid, and tables. anchor-size() is not included.

Used as an optimization hint for stacking contexts, containing blocks and layers. A hint does not always trigger advance optimization.

break-word retains its source distinction and acts as an emergency break opportunity. Newer values such as auto-phrase/manual are not implemented.

Retains the percentage component for paragraph measurement and painting. Actual spacing applies to inter-word spaces recognized by the backend.

word-wrap is a compatibility alias for overflow-wrap. anywhere/break-word participate in emergency line breaking, while intrinsic-sizing paths preserve their differences.

Layout and painting have vertical and sideways paths. Complex orthogonal layouts require acceptance checks for each combination. There is no separate text-orientation property; choosing a vertical direction does not establish complete Writing Modes coverage. Vertical inline/block layout and painting are implemented, but logical-property physicalization still uses only the horizontal-tb + direction mapping table. Some flex/grid/table branches explicitly require horizontal-tb.

Positioned elements and flex/grid items participate in stacking; auto is distinct from 0. Number handling still truncates values, so rejection of invalid non-integer values is not fully standards-compliant.

Absent from supportedLengthUnit and CSSUnit. Some legacy parsers treat unknown units as px; this does not provide the semantics of those units.

Requires 3/4/6/8 valid hexadecimal digits; alpha comes last.

All use the same keyframes parser; this does not imply support for other vendor-prefixed properties.

Matches right to left using DOM element relationships, ignoring non-element sibling nodes.

Matches right to left using DOM element relationships, ignoring non-element sibling nodes.

No namespace bindings or matcher have been established. Unknown tokens are skipped and may incorrectly reduce to an ordinary selector; this cannot be treated as support.

A complete built-in named-color table with ASCII case-insensitive matching. Color values are ultimately stored as 8-bit RGBA.

The same element must satisfy all simple selectors.

Matches right to left using DOM element relationships, ignoring non-element sibling nodes.

Absent from supportedLengthUnit and CSSUnit. Some legacy parsers treat unknown units as px; this does not provide the semantics of those units.

Suffix matching; certain HTML attribute values are ASCII case-insensitive by default.

Substring matching; certain HTML attribute values are ASCII case-insensitive by default.

Exact value equality; certain HTML attribute values are ASCII case-insensitive by default.

Attribute presence; certain HTML attribute values are ASCII case-insensitive by default.

Prefix matching; certain HTML attribute values are ASCII case-insensitive by default.

Matches an equal value or a value followed by a hyphen; certain HTML attribute values are ASCII case-insensitive by default.

Space-separated token matching; the implementation splits on ordinary spaces rather than all CSS whitespace. Certain HTML attribute values are ASCII case-insensitive by default.

Explicit ASCII case-insensitive matching.

The parser skips s as an unrecognized suffix. This is equivalent for attributes that are case-sensitive by default, but cannot force HTML attributes such as type and dir, which are case-insensitive by default, to become case-sensitive.

An explicit empty namespace prefix works; this does not imply support for arbitrary namespaces.

Includes UA/author, origin/layer/specificity/order and inline-declaration paths. Important declarations reverse layer order. Comments alone do not establish the full standard ranking across origins.

Pseudo-elements outside the known set do not match. Shadow DOM and general custom-highlight semantics are absent.

Only canonical identity forms that preserve currentColor semantics are implemented. Arbitrary relative colors and channel math are unsupported.

Matches right to left using DOM element relationships, ignoring non-element sibling nodes.

HTML tag names are matched in ASCII lowercase; class and id values remain case-sensitive.

HTML tag names are matched in ASCII lowercase; class and id values remain case-sensitive.

Custom names are case-sensitive, preserve tokens, inherit and participate in the cascade. @property typed registration and non-inheriting declarations are unsupported. An empty declaration defines an empty token sequence.

A comma-separated list matches any branch. The parser is error-tolerant; a nonempty AST does not establish support for arbitrary standard syntax.

HTML tag names are matched in ASCII lowercase; class and id values remain case-sensitive.