Guideline A.4.2: (For the authoring tool user interface) Document the user interface, including all accessibility features. [Implementing A.4.2] Rationale: Some authors may not be able to understand or operate the authoring tool user interface without documentation. A.4.2.1 Describe Accessibility Features: For each authoring tool feature that is used to meet Part A of ATAG 2.0, at least one of the following is true: (Level A) (a) Described in the Documentation: Use of the feature is explained in the authoring tool's documentation; or (b) Described in the Interface: Use of the feature is explained in the authoring tool user interface; or (c) Platform Service: The feature is a service provided by an underlying platform; or (d) Not Used by Authors: The feature is not used directly by authors (e.g. passing information to a platform accessibility service). Note: The accessibility of the documentation is covered by Guideline A.1.1 and Guideline A.1.2. Implementing A.4.2.1 A.4.2.2 Document All Features: For each authoring tool feature, at least one of the following is true: (Level AA) (a) Described in the Documentation: Use of the feature is explained in the authoring tool's documentation; or (b) Described in the Interface: Use of the feature is explained in the authoring tool user interface; or (c) Platform Service: The feature is a service provided by an underlying platform; or (d) Not Used by Authors: The feature is not used directly by authors (e.g. passing information to a platform accessibility service). Note: The accessibility of the documentation is covered by Guideline A.1.1 and Guideline A.1.2. Implementing A.4.2.2