h a `"main"` role are a type of region used to enclose the main content on the page. Providing a visible label for each main region on the page provides better context to all users including people using assistive technologies who rely on landmarks, to identify and navigate to the main content.

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### What to do

 * For each `<main>` element or element with `role="main"`, set the value of the `aria-labelledby` attribute to the `i