Why title tag is used in the hreflang markup?

Question

What is the practical use of Title tag in the hreflang markup?

<link rel="alternate" hreflang="x-default" href="https://www.mozilla.org/">
<link rel="alternate" hreflang="an" href="https://www.mozilla.org/an/" title="aragonés">
<link rel="alternate" hreflang="az" href="https://www.mozilla.org/az/" title="Azərbaycanca">

Answer 1

according to w3school it serves this purpose

Defines a preferred or an alternate stylesheet

https://www.w3schools.com/tags/tag_link.asp