Thank Tea, Darrel and Matt (on the other post) for the time you gave to resolve my issues. Darrel: no apologies. When I didn’t find your jQuery, I used the one that was attached in your early post. Perhaps this was the cause of the blank page. I’ll try the one you sent me yesterday and will come back to you.
Tea, if I check “initially hidden” property for the button that I want to hide from the screen reader, will that hide the button from the devices? If it works, I can check “initially hidden” and “show” the button when the page loads. What do you think?