IDs used in ARIA and labels must be unique

Unique ID's differentiate each element from another and prevent invalid markup, wherein only the first instance gets acted upon by client-side scripting, or where assistive technologies typically only reference the first one accurately.

Fixing the problem

Rename any duplicate ID values.

Duplicate IDs are common validation errors that may break the accessibility of labels, e.g., form fields, table header cells.

To fix the problem, change an ID value if it is used more than once to be sure each is unique. Unique ID's differentiate each element from another and prevent invalid markup, wherein only the first instance gets acted upon by client-side scripting, or where assistive technologies typically only reference the first one accurately.