Wherever possible, publish content as an HTML webpage, if you do need to publish a document, it should be in addition to the webpage.

Accessibility checker

If you are using Excel for Office 365 you can run the Accessibility Checker before sharing your spreadsheet.

Select the Review tab then Check Accessibility.

Structure

• Structure your document using Heading 1, Heading 2, etc, don't use bold to mark up content
• Merge cells to make headings clearer
• Name your worksheets
• Add metadata to your spreadsheet
• Use a contrast checker to avoid colors that cause an issue with colour blindness, red/green and blue/yellow combinations

Tables

• Use a simple table structure and specify column header information
• Ensure tables don't contain split cells, merged cells or nested tables
• Don't have any completely blank rows or columns
• Add alt text to your table

Links

Add meaningful hyperlink text. Links should convey clear and accurate information about the destination. 

For example, instead of linking to the text Click here, include the full title of the destination page.

Images

• Include alternative text with all visuals 
• In the alt text briefly describe the image and mention the existence of the text and it's intent
• Avoid using text in images as the sole method of conveying information. If you must use an image with text in it, repeat that text in the document.