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Why does this CSS margin-top style not work?

... form a single margin. Margins that combine this way are said to collapse, and the resulting combined margin is called a collapsed margin. Adjoining vertical margins collapse [...] Two margins are adjoining if and only if: both belong to in-flow block-level boxes that participate...
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Java EE 6 @javax.annotation.ManagedBean vs. @javax.inject.Named vs. @javax.faces.ManagedBean

...s work kind of independent, they boot in application server initialization and scan classes of all artifacts including jar, ejb-jar, war and ear files in deployment time and gather and store some metadata about them, then when you need an object of a class at runtime they will give you instances of ...
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How to quickly and conveniently disable all console.log statements in my code?

...e.log = function() {} That's it, no more messages to console. EDIT: Expanding on Cide's idea. A custom logger which you can use to toggle logging on/off from your code. From my Firefox console: var logger = function() { var oldConsoleLog = null; var pub = {}; pub.enableLogger = ...
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Get image data url in JavaScript?

... the same domain as the page, or has the crossOrigin="anonymous" attribute and the server supports CORS. It's also not going to give you the original file, but a re-encoded version. If you need the result to be identical to the original, see Kaiido's answer. You will need to create a canvas eleme...
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What are the differences between a multidimensional array and an array of arrays in C#?

What are the differences between multidimensional arrays double[,] and array-of-arrays double[][] in C#? 9 Answers ...
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Suppress Scientific Notation in Numpy When Creating Array From Nested List

...otation when printing numpy ndarrays, wrangle text justification, rounding and print options: What follows is an explanation for what is going on, scroll to bottom for code demos. Passing parameter suppress=True to function set_printoptions works only for numbers that fit in the default 8 characte...
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Getting number of elements in an iterator in Python

...s are in an iterator in Python, in general, without iterating through each and counting? 16 Answers ...
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How do you use “

I just finished reading about scoping in the R intro , and am very curious about the <<- assignment. 6 Answers ...
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Uninitialized constant ActiveSupport::Dependencies::Mutex (NameError)

... This is an incompatibility between Rails 2.3.8 and recent versions of RubyGems. Upgrade to the latest 2.3 version (2.3.11 as of today). share | improve this answer ...
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print call stack in C or C++

... option. Note that names of "static" functions are not exposed, and won't be available in the backtrace. share | improve this answer | follow ...