Using the right HTML elements when implementing forms is essential to ensure they can be used by as many people as possible including screen reader users. In this blog Léonie explains the correct usage of the fieldset and legend elements. On GOV.UK we often use groups of related form fields, like a set of radio buttons or checkboxes. These related fields might be used to offer multiple answers to a single question, or to ask for multiple pieces of information about the same thing.
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Read full article at Source: Using the fieldset and legend elements | Accessibility