PDFs and PowerPoints
PDF and PowerPoint files can be used to convey information, but neither is the perfect choice when it comes to accessibility. Depending on the browser and device configuration, these files may download rather than be displayed in the browser, which can be confusing on a mobile device like a smartphone.
If your content can be put into html on a regular page of your site, it is much more likely to be found by searching the site, and adaptive technology can act on the content more readily.
However, if your content must be in PDF form (for example, for formatting reasons), you can easily turn your PowerPoint and Word files into accessible PDFs.