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Can someone explain this 'double negative' trick? [duplicate]

I am by no means an expert at Javascript, but I have been reading Mark Pilgrim's "Dive into HTML5" webpage and he mentioned something that I would like a better understanding of. ...
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Text border using css (border around text)

Is there a way to integrate a border around text like the image below? 5 Answers 5 ...
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Correct way to convert size in bytes to KB, MB, GB in JavaScript

I got this code to covert size in bytes via PHP. 17 Answers 17 ...
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How can I convert a DateTime to the number of seconds since 1970?

I'm trying to convert a C# DateTime variable to Unix time, ie, the number of seconds since Jan 1st, 1970. It looks like a DateTime is actually implemented as the number of 'ticks' since Jan 1st, 0001. ...
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What is Weak Head Normal Form?

What does Weak Head Normal Form (WHNF) mean? What does Head Normal form (HNF) and Normal Form (NF) mean? 6 Answers ...
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Is there a way to iterate over a range of integers?

Go's range can iterate over maps and slices, but I was wondering if there is a way to iterate over a range of numbers, something like this: ...
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Why isn't my Pandas 'apply' function referencing multiple columns working? [closed]

I have some problems with the Pandas apply function, when using multiple columns with the following dataframe 6 Answers ...
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Why is a pure virtual function initialized by 0?

We always declare a pure virtual function as: 11 Answers 11 ...
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Pandas percentage of total with groupby

This is obviously simple, but as a numpy newbe I'm getting stuck. 14 Answers 14 ...
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Elastic Search: how to see the indexed data

I had a problem with ElasticSearch and Rails, where some data was not indexed properly because of attr_protected. Where does Elastic Search store the indexed data? It would be useful to check if the actual indexed data is wrong. ...