A list of CSS classes to be considered when parsing the raw markup. Usually included by the include directive (see Section 5.1.1, “The Include Directive”) but not necessarily. As best practice, all listed classes should be anchored.

Only classes listed and anchored here can be used for the transformation contexts and handlers.

Example:

      classes:
        - &headline_styles !!java.util.ArrayList
        - &headline_1_style p--heading-1
        - &headline_2_style p--heading-2
        - &headline_3_style p--heading-3
        - &headline_4_style p--heading-4
        - &headline_5_style p--heading-5
        - &headline_6_style p--heading-6
      ...