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What is the purpose of the '@' symbol in CSS?

I just stumbled across this question and I noticed the user is using some notation I've never seen before: 5 Answers ...
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What does GitHub for Windows' “sync” do?

With GitHub for Windows, you can "publish" a branch, and then "sync" that branch to GitHub. 4 Answers ...
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CSRF protection with CORS Origin header vs. CSRF token

This question is about protecting against Cross Site Request Forgery attacks only. 2 Answers ...
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Haskell: Where vs. Let

I am new to Haskell and I am very confused by Where vs. Let . They both seem to provide a similar purpose. I have read a few comparisons between Where vs. Let but I am having trouble discerning when to use each. Could someone please provide some context or perhaps a few examples that demonstr...
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How to quit a java app from within the program

What's the best way to quit a Java application with code? 12 Answers 12 ...
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How To Check If A Key in **kwargs Exists?

Python 3.2.3. There were some ideas listed here , which work on regular var's, but it seems **kwargs play by different rules... so why doesn't this work and how can I check to see if a key in **kwargs exists? ...
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leiningen - how to add dependencies for local jars?

I want to use leiningen to build and develop my clojure project. Is there a way to modify project.clj to tell it to pick some jars from local directories? ...
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PHP: merge two arrays while keeping keys instead of reindexing?

How can I merge two arrays (one with string => value pairs and another with int => value pairs) while keeping the string/int keys? None of them will ever overlap (because one has only strings and the other has only integers). ...
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How to compare two files not in repo using git

I'd like to compare two css files which are not in any git repository. Is there such a functionality in git? 3 Answers ...
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How can I check that a form field is prefilled correctly using capybara?

I have a field with a proper label that I can fill in with capybara without a problem: 4 Answers ...