how to define the path for image source in html5 preseent in desktop code example

Example 1: html not showing image with full path

use forward slah at the end of the sorce . example = <img src = "c:\bla bla\photo.jpg"/>

Example 2: html relative path

<!--The ./ means the contact.html file is in the same file 
as the file that is linked to it-->
<a href="./contact.html">Contact</a>