Module applicable_declarations 

Applicable declarations management.

Structs

ApplicableDeclarationBlock

A property declaration together with its precedence among rules of equal specificity so that we can sort them.

CascadePriority

The cascade-level+layer order of this declaration.

ScopeProximity

Proximity to the scope root.

Constants

PROXIMITY_INFINITY 🔒

Sacrifice the largest possible value for infinity. This makes the comparison trivial.

SOURCE_ORDER_BITS 🔒

Blink uses 18 bits to store source order, and does not check overflow [1]. That’s a limit that could be reached in realistic webpages, so we use 24 bits and enforce defined behavior in the overflow case.

SOURCE_ORDER_MASK 🔒

SOURCE_ORDER_MAX 🔒

Type Aliases

ApplicableDeclarationList

List of applicable declarations. This is a transient structure that shuttles declarations between selector matching and inserting into the rule tree, and therefore we want to avoid heap-allocation where possible.