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Word Documents can be made accessible BEFORE and AFTER a document is created, it is much EASIER to create an accessible document then to fix a document after it has been created.
Main errors to watch for:
Unnecessary use of spacebar
Word can automatically create a table of contents
Make sure your document is formatted using styles and layout
Add ALT-Text to images, tables, and graphs
DO NOT use random lines, spaces, dots, shapes, etc. to create tables, just use the table tool.
Recommend using Word suggested margins. Sometimes custom margins have a difficult time adjust between PDF, Word, Pages, etc.