add png favicon code example
Example 1: png favicon
<link rel="icon" type="image/png" href="logo.png" />
Example 2: html favicon from png
<link rel="icon" type="image/png" href="http://example.com/image.png" />
<link rel="icon" type="image/png" href="logo.png" />
<link rel="icon" type="image/png" href="http://example.com/image.png" />