External links do not convey the information about external redirect for screen readers

[HRemonen]

External links with the icon are fine for users with normal or limited sight. However as the icon has aria-hidden="true" they are not conveyed to screen reader users.

This is not a direct WCAG requirement it is still best practice.

How to fix

Add alt="opens in new window" and remove the aria-hidden attribute. Or add a element with the content "opens in a new window" and add a aria-describedby attribute to the element which points to the element.