Some basics for making your website and online materials accessible.
-No information conveyed through typeface, color, etc.
-Colors do not make it harder to see what is being said. Alexa Heinrich has a great chart for examining color contrast.
-Images carry explanations of what the image is, either in alt-text or in captions (or both).
-Links are explained.
-When PDFs are posted, they are accessible. More on what this means is at this link on PDF Accessibility. Currently, in order to make it so that a PDF is screen-reader friendly and has all of these great features, you need Adobe Pro. If you are posting PDFs for a course or as any part of a university project, it is incumbent upon your institution to make these PDFs accessible and you should not have to pay for it out of pocket (does this always happen? No). Keep in mind that if you are scanning a chapter from a physical book, the scan will not be accessible until you run it through Scan & OCR. Sadly, accessible PDFs are not born–they are made.
Rachel Levit Ades 