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Using margin:auto to vertically-align a div

...middle because it's not applicable to block-level elements margin-top:auto and margin-bottom:auto because their used values would compute as zero margin-top:-50% because percentage-based margin values are calculated relative to the width of containing block In fact, the nature of document flow and ...
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float:left; vs display:inline; vs display:inline-block; vs display:table-cell;

... we can do about that now though. But the important thing is it does work, and it works in all browsers (even IE6/7), so use it if you like it. The additional markup for clearing may not be necessary if you use the :after selector to clear the floats, but this isn't an option if you want to suppor...
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Apache Spark: map vs mapPartitions?

What's the difference between an RDD's map and mapPartitions method? And does flatMap behave like map or like mapPartitions ? Thanks. ...
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Best way to initialize (empty) array in PHP

...o = [] rather than var foo = new Array() for reasons of object creation and instantiation. I wonder whether there are any equivalences in PHP? ...
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Call to undefined method mysqli_stmt::get_result

...hat worked. I uncommented the extension=php_mysqli_mysqlnd.dll in php.ini; and restarted Apache2.2 and MySQL services. Should I uncomment the line extension=php_mysqli_libmysql.dll? As per another page, mysqlnd is faster than libmysql. Also, can I expect mysqlnd installed on most popular hosting ser...
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Simulating Slow Internet Connection

...ndows, fiddler is a great tool. It has a setting to simulate modem speed, and for someone who wants more control has a plugin to add latency to each request. I prefer using a tool like this to putting latency code in my application as it is a much more realistic simulation, as well as not making m...
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How do I make a composite key with SQL Server Management Studio?

...ht multiple fields, click the blocks in front of the columns "column name" and "data type" and such. Ctrl/Shift+Clicking on the column name fields won't actually do anything. – Pimgd Oct 10 '13 at 14:50 ...
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Gem::LoadError for mysql2 gem, but it's already in Gemfile

...his question by me 8 September 2015 so use the above line in your Gem file and run: bundle install You should be good to go share | improve this answer | follow ...
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100% Min Height CSS layout

In particular if you have a layout with a header and footer of fixed height , 13 Answers ...
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Join/Where with LINQ and Lambda

I'm having trouble with a query written in LINQ and Lambda. So far, I'm getting a lot of errors here's my code: 9 Answers ...