The Accessibility Check feature in PDF-XChange Editor enables you to verify whether documents conforms to international accessibility standards. Conformance with these standards ensures accessibility for people with disabilities who use technology such as screen readers, screen magnifiers and other equipment to navigate and read electronic content. The Accessibility Check contains thirty-two rules that are used to determine the accessibility of documents. They concern specific elements of documents and are therefore grouped into the following categories:
•Accessibility Permission Flag reports the need to enable the security settings that permit accessibility. This is because some documents contain permission settings that prevent them from being copied, edited, printed, extracted and/or annotated. These settings may interfere with a screen reader's ability to read the document, because screen readers must be able to copy or extract document text in order to read it to the user. The Accessibility Permission Flag reports whether or not it is necessary to turn on the security settings that allow accessibility for the screen reader.
•Image-Only PDF reports that documents contains only inaccessible, non-text content such as images. (Note that some images may be of text - in those cases, if the document does not contain fonts, then the text will not be recognized).
•Screen Flicker reports whether documents contain content that causes the screen to flicker. This type of content can be difficult to see when the screen is magnified and can cause seizures in people who have photosensitive epilepsy.
•Scripts reports whether documents contain scripts that interfere with keyboard navigation or prevent the use of input devices. Document content and functionality must not be script-dependent unless it is accessible to assisting technology.
•Accessible Links reports whether the URLs in documents are tagged correctly, as well as whether there are several identical links within the same document. URLs must be active and correctly tagged in order to be accessible to screen readers.
•Figures Alternate Text reports whether document images either have alternate text or are marked as artifacts. All document images must fall into these categories in order to conform to accessibility standards.
•Associated with Content reports whether alternate text is associated with page content. This rule is necessary because in cases where document elements have alternate text but do not contain page content it is not possible to determine the document page with which the alternate text is associated.
•Hides Annotation reports whether alternate text hides annotations, because screen readers are unable to read annotations in cases where they are nested under a parent element that has alternate text.
Please note that the structure of tables is often complex, and therefore it is advised that a manual check is performed in order to ensure that tables conform to accessibility standards.
•List Items reports whether each list item is a child of a list. List elements must contain list item elements, and list item elements must contain only label elements and list item body elements, in order to conform to accessibility standards.