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From HTML WG comments: - Guideline 1.4 This requires the author to perform structure-based edits. The document structure being edited should be without error correction performed. Assistive technology vendors often have to deal with bad content as the DOM structure they are processing does not match that which is rendered. So, if the authoring tool operates off of corrected content the results may not meet the needs of the impaired user while being used by an assistive technology. This should not be limited to only target device independence. The second issue is that the author must be able to enumerate the available actions which can be taken at a given object and selectively activate them. For content which provides text equivalents for the corresponding action such as the new access feature in XHTML 2.0 this information should be provided to the author. An action may cause an action to occur which moves focus.