Have you ever noticed the little icon that appears at the left end of your browser’s address bar when you visit most websites? Sometimes they also appear in your browser tab, as in Figure 2.19.

Figure 2.19  The bignerdranch.com favicon.ico

That is the favicon.ico image file. Many sites have one, and browsers request one by default. Because Ottergram does not have one, you may see an error like the one in Figure 2.20 in the DevTools.

Figure 2.20  Error about missing favicon.ico

Do not worry about this error if it appears. It will not affect your project. However, you can easily add a favicon.ico image – and that is your first challenge.