Add to Home Screen Icon HTML5

How can we add an Icon for Home Screen in HTML5 when we browse a webpage in chrome app and in option we choose Add To Home Screen. then theres an Icon Shortcut placed on your Home Screen.

I used:

<link rel="apple-touch-icon-precomposed" href="...\icon.png">

<link rel="apple-touch-icon" href="...\icon.png">

nothing happens it display again a default icon.! Just Like the AmStalker Home Screen Icon

What is the best way to do it?