Fieldsets
Fieldsets are used to group related form elements. They are added automatically by the radio button, checkbox and date helpers but can be manually applied to other groups where applicable.
A fieldset for capturing an address
A common use case for fieldsets is grouping address fields. The individual components of an address don’t really make sense alone so grouping them is a logical step. The grouping also improves the experience for screen reader users, the screen reader will announce the legend before reading the individual field labels.