close for html code example

Example 1: html how to close tag

<!--Take your starting tag and place it in the end with a / in front of it.-->
<p>Hello World</p>
<a href="#">Hello World</a>

Example 2: how to enter through a button that is closed in a html code

<button type="button" 
        onclick="window.open('', '_self', ''); window.close();">Discard</button>