Tinycon allows the addition of alert bubbles and changing the favicon image. Tinycon gracefully falls back to a number in title approach for browsers that don't support canvas or dynamic favicons.

Alerts in the favicon allow users to pin a tab and easily see if their attention is needed.

"DEFENDER of the favicon is a JavaScript remake of Eugene Jarvis' brilliant arcade game Defender written by Mathieu 'p01' Henri and inspired by Scott Schiller's experiment with generated favicons VU meter. The idea was to push the concept of generated favicons further and pack a thrilling retro shooter in 16×16 pixels using JavaScript, canvas and data: URIs."