Part A Conformance Applicability Notes: Scope of "authoring tool user interface": The Part A success criteria apply to all aspects of the authoring tool user interface that are concerned with producing the "included" web content technologies. This includes views of the web content being edited and features that are independent of the content being edited (e.g. menus, button bars, status bars, user preferences, documentation). Reflected content accessibility problems: The authoring tool is responsible for ensuring that editing-views display the web content being edited in a way that is more accessible to authors with disabilities (e.g. ensuring that text alternatives in the content can be programmatically determined). However, where an authoring tool user interface accessibility problem is caused directly by the content being edited (e.g. if an image in the content lacks a text alternative), then this would not be considered a deficiency in the accessibility of the authoring tool user interface. Developer control: The Part A success criteria only apply to the authoring tool user interface as it is provided by the developer. They do not apply to any subsequent modifications by parties other than the authoring tool developer (e.g. user modifications of default settings, third-party plug-ins). User agent features: Web-based authoring tools may rely on user agent features (e.g. keyboard navigation, find functions, display preferences, undo features) to satisfy success criteria. Conformance claims are optional, but any claim that is made must record the user agent(s). Accessibility of features provided to meet Part A: The Part A success criteria apply to the entire authoring tool user interface, including any features added to meet the success criteria in Part A (e.g. documentation, search functions). The only exemption is for preview features, as long as they meet the relevant success criteria in Guideline A.3.7. Previews are treated differently than editing-views because all authors, including those with disabilities, benefit when preview features accurately reflect the functionality of user agents that are actually in use by end users. Unrecognizable content: When success criteria require authoring tools to treat web content according to semantic criteria, the success criteria only apply when these semantics are encoded programmatically (e.g. text describing an image can only be considered a text alternatives for non-text content when this role is encoded within markup).