You can save as XML and the tags in the tags panel become the <tags> in the XML. That's the only way I know to see all the text.
Thank you, confirmed. Alas, it doesn't work with secured documements that I don't have permissions for, but it will help me with other documents.
"...text that will be read aloud to screen readers."
An export to text (accesible) will let you accomplish this.
Thanks. That seems to be appropriate for alt text; not so much for tables, since it doesn't include the structures.