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Why em instead of px?

I heard you should define sizes and distances in your stylesheet with em instead of in pixels. So the question is why should I use em instead of px when defining styles in css? Is there a good example that illustrates this? ...
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In eclipse, unable to reference an android library project in another android project

As I was writing up this question I managed to solve it so repeat it here for the benefit of others. Here is the initial problem: ...
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Reminder - \r\n or \n\r?

I just can't remember those. So, what is the right way to properly terminate old fashioned ASCII lines? 10 Answers ...
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Removing colors from output

I have some script that produces output with colors and I need to remove the ANSI codes. 13 Answers ...
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Cropping an UIImage

I've got some code that resizes an image so I can get a scaled chunk of the center of the image - I use this to take a UIImage and return a small, square representation of an image, similar to what's seen in the album view of the Photos app. (I know I could use a UIImageView and adjust the crop ...
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do..end vs curly braces for blocks in Ruby

I have a coworker who is actively trying to convince me that I should not use do..end and instead use curly braces for defining multiline blocks in Ruby. ...
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How can I check if a background image is loaded?

I want to set a background image on the body tag, then run some code - like this: 10 Answers ...
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How do I force Sublime Text to indent two spaces per tab?

Is there a way to force Sublime Text 2 to always indent two spaces per tab when working with Ruby files? 6 Answers ...
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How can I convert an RGB image into grayscale in Python?

I'm trying to use matplotlib to read in an RGB image and convert it to grayscale. 12 Answers ...
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Using margin:auto to vertically-align a div

So I know we can center a div horizontally if we use margin:0 auto; . Should margin:auto auto; work how I think it should work? Centering it vertically as well? ...