Module prop_cache 

Cache for CSS Properties CSS property cache for efficient style resolution and animation.

This module implements a cache layer between the raw CSS stylesheet and the rendered DOM. It resolves CSS properties for each node, handling:

• Cascade resolution: Computes final values from CSS rules, inline styles, and inheritance
• Pseudo-class states: Caches styles for :hover, :active, :focus, etc.
• Animation support: Tracks animating properties for smooth interpolation
• Performance: Avoids re-parsing and re-resolving unchanged properties

Architecture

The cache is organized per-node and per-property-type. Each property has a dedicated getter method that:

1. Checks if the property is cached
2. If not, resolves it from CSS rules + inline styles
3. Caches the result for subsequent frames

Thread Safety

Not thread-safe. Each window has its own cache instance.

Structs

CssDependencyChain

A dependency chain for a CSS property value. Example: [10% of node 10, then 1.2em of that, then 1.5em of that]

CssPropertyCache

CssPropertyCachePtr

CssPropertyWithOrigin

A CSS property with its origin tracking.

Enums

CssDependencyChainStep

Represents a single step in a CSS property dependency chain. Example: “10% of node 5” or “1.2em of node 3”

CssPropertyOrigin

Tracks the origin of a CSS property value. Used to correctly implement the CSS cascade and inheritance rules.