Is there a space between <br and /> is it <br/> or <br />.

Answer 1

it is <br> for html no need to close the br statement

in xHTML you need to close the br statement with <br />

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

Answer 2

all of them work accurately you need to close the tag if you want to parse the document by an XML parser or you are writing in xhtml etc