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Images outside of viewport (visible part of web page) wont be loaded before user scrolls to them
Tinycon: A small library for manipulating the favicon. 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.