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What is auto do in margin:0 auto;?

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Aug 04.2006

I cant seem to exactly understand what auto does. I know it sometimes have an effect of centering objects. That’s about it. Thanks.

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@KravvitzAug 04.2006 — [b][For] Block-level, non-replaced elements in normal flow[/b]

[...]

If both 'margin-left' and 'margin-right' are 'auto', their computed values are equal.[/quote]
http://www.w3.org/TR/REC-CSS2/visudet.html#q6
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@mark_yiehAug 04.2006 — margin: auto will automatically make all the margins to have the same value. If you didn't set a size for the tag that you are placing the margin: auto property, then there isn't going to be any visual difference. It does help to center a document, but only if the width property has been set. For example:

.body {width: 800px; margin: 0px, auto;}
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