Tooltip

In PDF forms, a tooltip is the programmatic label associated with a form field that assistive technologies read aloud when the user reaches that field. Unlike HTML, PDF does not have a native label-to-field association, so the tooltip carries the accessible name. Best practice requires that a tooltip match the visible label for text fields, combine a group label plus the specific choice label for radios and checkboxes (e.g., 'Sex: Male'), and for fields inside a table combine the column header and row name. Additional hierarchical or format information (e.g., 'Date of Birth, MMDDYYYY, Required') can be appended. In browser UIs more broadly, a tooltip is small pop-up text shown on hover or focus; for accessibility, browser tooltips must also be keyboard-focusable and not rely on hover alone.