In the <hr\> tag

Question

Is it necessary to put \ cause it is still working

Answer 1

<hr /> with forward slash is in XHTML syntax.
<hr> is the correct HTML5 variant. In your case, even if you misstyped it, the browser sees it as <hr> anyway.

Answer 2

the \ is not necessary

source: https://www.w3.org/TR/html-markup/hr.html

Answer 3

I think not bcoz this tag needs no end tag

Answer 4

In html5 it will still work. But if you want your document readable by XML parsers, you must use / slash and write as <hr /> with a space between hr and /.

Answer 5

no its not