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What, exactly, is needed for “margin: 0 auto;” to work?

I know that setting margin: 0 auto; on an element is used to centre it (left-right). However, I know that the element and its parent must meet certain criteria for the auto margin to work, and I can never seem to get the magic right. ...
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How to produce a range with step n in bash? (generate a sequence of numbers with increments)

... 201 I'd do for i in `seq 0 2 10`; do echo $i; done (though of course seq 0 2 10 will produce the...
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The role of #ifdef and #ifndef

...d" while ifndef means "if the following is not defined". So: #define one 0 #ifdef one printf("one is defined "); #endif #ifndef one printf("one is not defined "); #endif is equivalent to: printf("one is defined "); since one is defined so the ifdef is true and the ifndef is false. It ...
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How to get the date from jQuery UI datepicker

... CoolEshCoolEsh 3,02611 gold badge1717 silver badges2424 bronze badges ...
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Preferred way to create a Scala list

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Algorithm to generate all possible permutations of a list?

... answered Apr 26 '10 at 1:53 WhirlWindWhirlWind 13k22 gold badges3737 silver badges4040 bronze badges ...
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Positioning MKMapView to show multiple annotations at once

I've got several annotations I want to add to my MKMapView (it could 0-n items, where n is generally around 5). I can add the annotations fine, but I want to resize the map to fit all annotations onscreen at once, and I'm not sure how to do this. ...
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Combine :after with :hover

...elected:after, #alertlist li:hover:after { position:absolute; top: 0; right:-10px; bottom:0; border-top: 10px solid transparent; border-bottom: 10px solid transparent; border-left: 10px solid #303030; content: ""; } ...
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Is it safe to use -1 to set all bits to true?

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Maven project.build.directory

...e super pom. You find the jar here: ${M2_HOME}/lib/maven-model-builder-3.0.3.jar Open the jar with 7-zip or some other archiver (or use the jar tool). Navigate to org/apache/maven/model There you'll find the pom-4.0.0.xml. It contains all those "short cuts": <project> ... &lt...