Crate hypersig_style 

Typed atomic CSS for hypersig.

A Style is built from one method per standard CSS property, and per anchor positioning property, which MDN’s data still marks experimental although every major engine ships it. A misspelled property or keyword does not compile. Each declaration becomes one class whose name is derived from the declaration, and a Sheet collects the styles a page uses and writes each rule once.

The property list, each property’s keywords, the pseudo-classes, the pseudo-elements, and the named colors are generated from MDN’s CSS data (mdn-data 2.37.2). Where a property accepts a value made of one keyword or one value of a type in value, that value is typed. The forms the generator leaves out, such as margin: 0 auto or a calc(), go through value::Raw and are not checked. Ranges are not checked either, so a negative width is accepted and the browser drops it.

Use it through the hypersig crate.

Modules

pattern

Layouts used often enough to name, each a function that returns a Style.

value

The value types a property method accepts, and functions that build them.

Structs

Bucket

The rules of one place in the order: one cascade layer, one set of conditions, and one shorthand rank, or one @keyframes rule.

FontFace

A font the page loads, written as @font-face.

Global

Rules for elements by their tag, and the fonts the page loads.

Keyframes

The steps of an animation, written as @keyframes <name>.

Sheet

The rules for a set of styles, each declaration written once.

Style

A set of CSS declarations, each of which becomes one class.

Theme

Values for tokens across the whole page, written on :root.

Token

A named value of type T, written as the custom property --<name>.

Enums

Condition

A condition that Style::on applies a part of a style under.

Container

A width of the nearest query container a part of a style applies from.

Element

An HTML element, by its tag.

Media

A media feature a part of a style applies under.

Property

A standard CSS property, or one of the anchor positioning properties.

PseudoClass

A standard pseudo-class without arguments.

PseudoElement

A standard pseudo-element without arguments, and ::picker(select).

Selector

What a Global rule applies to.

Constants

BASE_LAYER

The cascade layer of a Global’s rules, after TOKEN_LAYER and before LAYER, so an element’s classes override them.

LAYER

The cascade layer of the classes from Sheet::add.

TOGGLED_LAYER

The cascade layer of the classes from Sheet::add_toggled, which comes after LAYER, so a toggled declaration overrides an element’s own.

TOKEN_LAYER

The cascade layer of a Theme’s values, before LAYER.

Traits

TokenValue

A value type a Token can hold.