Principles of building accessible documents

As we discussed in previous chapters, a PDF document is the final product of work done in other applications where both text and images are placed and organized on pages. Here are some guidelines for authors to consider:

Principle	Reason
Provide equivalent alternative text	Alternative text (alt text) provides a description of non-text content. It is especially helpful for people who are blind and rely on a screen reader to have the content of images read to them.
Charts and diagrams should include expanded text	The expanded description should convey the meaning of data presented in a chart or a diagram. For a very long description, a link can be provided to a different area of the publication with expanded text.
Create a logical...