en there are multiple elements with a `"complementary"` role, they must have unique labels that clearly describe the region's content. This includes `<aside>` elements, which have the implicit role of `"complementary"`. These labels help people using assistive technologies to quickly find and navigate to each region.

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### What to do

* For each element with a `"complementary"` role, either set the value of the `aria-labelledby`