Is there such information in html?

Question

HTML

for example, just
write like that?

<button>Кнопка</button>
<h1>Заголовок</h1>
<a>Ссылка</a>

Or write like that?

<button>
    Кнопка
</button>
<h1>
    Заголовок
</h1>
<a>
    Ссылка
</a>

Is there such information on tags and if so , please share.

Answer 1

Code design rules

Answer 2

Difference in the line
break character For plain text, this does not matter