Module subset 

The CSS subset as data.

A host with a style editor needs to know what the engine accepts before a sheet is sent: which properties, which values, which selectors. This module describes that from the tables the parser dispatches through, so the description and the parser cannot drift: a property is in the description because the parser reads it, and reads it because it is in the table.

The syntax strings use CSS value-definition syntax. A bare word is a keyword, <name> is a type, name() is a function. The keywords are also listed on their own, for a host that would rather complete them than parse the grammar; where one stands in the grammar is still the grammar’s to say.

Structs

Descriptor

One @font-face descriptor.

FontFace

The @font-face rule.

MarginBoxDescription

One margin box.

Page

The @page rule.

PageSize

One named page size.

Property

One property.

Selector

One piece of selector syntax, with a selector that uses it.

Selectors

The selector vocabulary.

Subset

What the engine accepts, from the version that produced it.