A favicon is an icon for your website. You can see it at left of the address bar and in your bookmarks. A favicon permits you to add customisation and personnality to your website.
How to create a favicon for your website? Very easy and quick!
You want your pages to be W3C valid? Well! But if you own a website that has more than 10 pages, that may become a huge task to validate them all, one by one.