Breakout Boxes

Reference implementation

To associate aria-labelledby with the respective id, they must share a value and that value must be unique. In your templating system, you can create a unique string at the time of compilation using Date():

const unique = + new Date(); // e.g. 1540915290281

An id that is not unique is considered a parsing error and, since it affects accessible naming associations here, would mean a failure under WCAG 4.1.1 Parsing^[3].