HTML Guide for self-closing tags

The <br> tag inserts a line break, and it’s self-closing so you can use either <br> or <br/> but </br> is invalid.

As the <br> tag is a void element, it doesn’t need a closing tag, so <br> is preferred to <br/>.

First line<br>
Second line is also valid but discouraged.<br/>
Third line is invalid</br>