html - how do icon maps (or chart) work? -


i found similar while inside websites source code
icons gathered in 1 chart .. realized later refer each icon separately when needed. found article image mapping in w3schools
gift me main idea still need how works can have more information how done ? articles or learn more thank everyone

enter image description here

they're called 'css sprites', chris coyier wrote pretty authoritative article on subject http://css-tricks.com/css-sprites/


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