Is it ok to change table caption depending on user choices?

1. Are table captions required for accessibility?
2. Should table captions be above or below?
3. What is the difference between a caption and a summary?

Are table captions required for accessibility?

The caption is the first element within the table, and is required. The following example is of a slightly more complex table. We have header cells for both column and rows.

Should table captions be above or below?

A figure caption is centered under the figure; a table caption is centered above the table (if a caption is more than one line, make it left justified). A Figure and its caption should appear on the same page. All captions should start with a capitalized word and end with a period.

What is the difference between a caption and a summary?

The caption is provided by the <caption> element. A summary conveys information about the organization of the data in a table and helps users navigate it.