The aria-describedby attribute should associate a UI control with its text description, via the id attribute on the element where the text to be used as the description is found.
Find <input>,<select>,<a>,<textarea>,<button>,[role='button'],[role='checkbox'],[role='combobox'],[role='link'],[role='listbox'],[role='menuitem'],[role='menuitemcheckbox'],[role='menuitemradio'],[role='option'],[role='radio'],[role='scrollbar'],[role='slider'],[role='spinbutton'],[role='switch'],[role='tab'],[role='textbox'] elements using an aria-describedby attribute where one of the following apply:
The aria-describedby attribute provides additional information to help AT users get descriptive information about a user interface element.