Tables
Avoid using tables for layout purposes because they can result in an unorganized reading order for individuals using assistive technologies. In addition, knowledge of the code is necessary.
PDFs
Creating accessible PDFs or fixing accessibility problems in existing PDF files is complicated and time-consuming. An Adobe Acrobat Pro license is required.
If you'd like to check the accessibility of any documents in your guides, you can use PAVE - a free online tool that checks PDF accessibility, makes automatic corrections, and guides you through any remaining issues.
Video tutorial on formatting table content, created by the ADA National Network. Published under a Creative Commons Attribution license