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CSS Sprites: What They Are, Why They’re Cool, and How To Use Them
Published by Chris Coyier This post was originally co-authored in late 2007 by me and Volkan Görgülü, I'm updating it now to improve it a bit and make it more current. You've heard of them, but... Do you really understand them? The name might be a little misleading, because sprites aren't little images like you might be picturing, a sprite is actually one big image . Have you ever seen the CSS technique where the "on" and "off" states of a button are contained within the same image and are activated by shifting the background-position?
Most CSS properties are quite simple to deal with. Often, applying a CSS property to an element in your markup will have instant results — as soon as you refresh the page, the value set for the property takes effect, and you see the result immediately. Other CSS properties, however, are a little more complex and will only work under a given set of circumstances. The z-index property belongs to the latter group. z-index has undoubtedly caused as much confusion and frustration as any other CSS property.
the-z-index-css-property-a-comprehensive-look
The size of an image in a website layout is important. From proper alignment to getting just the right amount of white space, sizing photos and graphics properly beforehand is essential to creating a balanced look. Images on the web are measured in pixels . Yet many people go through the trouble of setting their images to 72 dots per inch ( DPI ).
The Myth of DPI