how to add fevicons to a website html code example

Example 1: html favicon

<link rel="shortcut icon" type="image/png" href="http://example.com/favicon.png"/>

Example 2: head icon html

<link rel="icon" href="http://example.com/favicon.png">

Example 3: favicon for html page

<link rel="icon" type="image/png" href="/favicon.png"/>
<link rel="icon" type="image/png" href="https://example.com/favicon.png"/>