"""
Create at least this:
Sizes Name Purpose
16x16 & 32x32 favicon.ico Default required by IE. Chrome and Safari may pick ico over png, sadly.
"""
Hum, je me demande si ce que dit ce github, dont le dernier commit date de mai 2014, est toujours vrai (nécessité d'avoir un favicon.ico).

En tout cas moi ça fait bien longtemps que j'utilise un rel="icon" type="image/png" sur mon blog. Ra n'à fout!

EDIT1: pratique "Firefox Social" pour bypasser les protections CRSF de github par exemple. introduit dans Shaarli Community depuis Mai (https://github.com/shaarli/Shaarli/commit/d33c5d4c3b9c70441391a08e8bcb2a8c639a4635)

EDIT2: http://realfavicongenerator.net/faq
"""
Note that favicon.ico is only used by IE (as long as you use the code returned by RealFaviconGenerator). So the other browsers and platforms, such as Chrome on Windows or Safari on iOS, are not affected by this overweight icon.
"""
donc OSEF. Si vous voulez faire plaisir à IE, mettez le favicon.ico à la racine mais ne déclarez pas comme dit ici: http://realfavicongenerator.net/faq#why_ico_not_declared
"""
When your favicon is in the root directory, RealFaviconGenerator does not generate this code. This is because it somehow disrupts some other browsers like Chrome. And since IE looks for a file named favicon.ico anyway, the best solution is to not even talk about it. This is described by Jonathan T. Neal and Mathias Bynens.
"""

EDIT3: IE ne sait gérer les favicon PNG que depuis la version 11 (https://en.wikipedia.org/wiki/Favicon#File_format_support) lulz