Fixing broken anchor links in PDFs. This problem is specific to Word-originated files. It does not occur with documents created in InDesign
Specifically, if the original colours were, say, black text on a pink background, and if a user set his or her preferences to yellow text on a black background, Acrobat or Reader would convert the text colour to yellow as required, but would not recognise the background correctly and so leave its colour unchanged. The outcome, of course, would be (a hard-to-read) yellow text on a pink background.
Creating accessible links in PDFs is a basic accessibility requirement. This article looks at a selection of techniques for tagging links correctly to ensure that they are both keyboard operable and usable with a screen reader. It also looks at, amongst other things, how to make URLs more intelligible for screen reader users. It is helpful to screen reader users to provide a text alternative for such links in order to make them easier to understand
Justified text used inappropriately can cause serious readability problems. With simple justified text the uneven variation in spacing between words makes the text more difficult to read because, instead of moving smoothly along the line, the eye has to jump from word to word. For people with certain disabilities such as dyslexia the problems can be serious; justification can interfere with their ability to understand the text at all.
Used correctly, italics can enhance copy by adding both meaning and style. However, a little care needs to be taken to ensure readability, correct semantics and the avoidance of potentially serious page layout problems.