Guideline B.4.1: Ensure the availability of features that support the production of accessible content. [Implementing B.4.1] Rationale: The accessible content support features will be more likely to be used, if they are turned on and are afforded reasonable prominence within the authoring tool user interface. B.4.1.1 Features Active by Default: All accessible content support features are turned on by default. (Level A) Implementing B.4.1.1 B.4.1.2 Option to Reactivate Features: The authoring tool does not include the option to turn off its accessible content support features or features which have been turned off can be turned back on. (Level A) Implementing B.4.1.2 B.4.1.3 Feature Deactivation Warning: The authoring tool does not include the option to turn off its accessible content support features or, if these features can be turned off, authors are informed that this may increase the risk of content accessibility problems (WCAG). (Level AA) Implementing B.4.1.3 B.4.1.4 Feature Prominence: All accessible content support features are at least as prominent as features related to either invalid markup, syntax errors, spelling errors or grammar errors. (Level AA) Implementing B.4.1.4