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How can I define colors as variables in CSS?

I’m working on a CSS file that is quite long. I know that the client could ask for changes to the color scheme, and was wondering: is it possible to assign colors to variables, so that I can just change a variable to have the new color applied to all elements that use it? ...
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Is there a way for non-root processes to bind to “privileged” ports on Linux?

It's very annoying to have this limitation on my development box, when there won't ever be any users other than me. 23 Answ...
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.gitignore all the .DS_Store files in every folder and subfolder

I've added .DS_Store to the .gitignore file, but it seems that it is only ignoring .DS_Store in the root directory, not in every folder and subfolder. ...
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What is an Intent in Android?

... to happen. Depending on the intent, apps or the OS might be listening for it and will react accordingly. Think of it as a blast email to a bunch of friends, in which you tell your friend John to do something, or to friends who can do X ("intent filters"), to do X. The other folks will ignore the em...
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How to do ToString for a possibly null object?

... C# 6.0 Edit: With C# 6.0 we can now have a succinct, cast-free version of the orignal method: string s = myObj?.ToString() ?? ""; Or even using interpolation: string s = $"{myObj}"; Original Answer: string s = (myObj ?? String.Empty...
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Easiest way to activate PHP and MySQL on Mac OS 10.6 (Snow Leopard), 10.7 (Lion), 10.8 (Mountain Lio

... Open a good text editor (I'd recommend TextMate, but the free TextWrangler or vi or nano will do too), and open: /etc/apache2/httpd.conf Find the line: "#LoadModule php5_module libexec/apache2/libphp5.so" And uncomment it (remove ...
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Checking if sys.argv[x] is defined

...cept and testing len(sys.argv) isn't all that significant. They're both a bit hackish compared to argparse. This occurs to me, though -- as a sort of low-budget argparse: arg_names = ['command', 'x', 'y', 'operation', 'option'] args = dict(zip(arg_names, sys.argv)) You could even use it to gener...
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Conditional formatting based on another cell's value

...- C5. If C5 is greater than 80% then the background color is green but if it's below, it will be amber/red. 6 Answers ...
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Getting the application's directory from a WPF application

I found solutions for Windows Forms with AppDomain but what would be the equivalent for a WPF Application object? 8 Answe...
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Set value of hidden field in a form using jQuery's “.val()” doesn't work

...een trying to set the value of a hidden field in a form using jQuery, but without success. 16 Answers ...