Enum PseudoElementCascadeType

pub enum PseudoElementCascadeType {
    Eager,
    Lazy,
    Precomputed,
}

This enumeration determines how a pseudo-element cascades.

Variants

Eager

Eagerly cascaded pseudo-elements are “normal” pseudo-elements (i.e. ::before and ::after). They inherit styles normally as another selector would do, and they’re computed as part of the cascade.

These kind of pseudo-elements require more up-front computation and storage and thus should used for public pseudo-elements that can be used on many element types (such as ::before and ::after).

Lazy

Lazy pseudo-elements are affected by selector matching, but they’re only computed when needed, and not before. They’re useful for general pseudo-elements that are not very common or that do not apply to many elements. For instance in Servo this is used for ::backdrop and ::marker.

Precomputed

Precomputed pseudo-elements skip the cascade process entirely, mostly as an optimisation since they are private pseudo-elements (like ::-servo-details-content).

This pseudo-elements are resolved on the fly using only global rules (rules of the form *|*), and applying them to the parent style so are mainly useful for user-agent stylesheets.

Trait Implementations

impl Clone for PseudoElementCascadeType

fn clone(&self) -> PseudoElementCascadeType

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for PseudoElementCascadeType

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PartialEq for PseudoElementCascadeType

fn eq(&self, other: &PseudoElementCascadeType) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for PseudoElementCascadeType

impl StructuralPartialEq for PseudoElementCascadeType