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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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Twitter's typeahead.js suggestions are not styled (have no border, transparent background, etc.)

I'm using twitter's typeahead.js 0.9.3 and it seems my suggestions are not styled at all. 9 Answers ...
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pyplot scatter plot marker size

In the pyplot document for scatter plot: 6 Answers 6 ...
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Matplotlib discrete colorbar

I am trying to make a discrete colorbar for a scatterplot in matplotlib 7 Answers 7 ...
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Warning: Null value is eliminated by an aggregate or other SET operation in Aqua Data Studio

I have a problem when data is null and the warning has appear when the result is display. How to solve this problem?. How to change the null data to 0 when no data in the table?. ...
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How to get first character of string?

I have a string, and I need to get its first character. 16 Answers 16 ...
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How to debug a GLSL shader?

I need to debug a GLSL program but I don't know how to output intermediate result. Is it possible to make some debug traces (like with printf) with GLSL ? ...
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Fastest way to flatten / un-flatten nested JSON objects

I threw some code together to flatten and un-flatten complex/nested JSON objects. It works, but it's a bit slow (triggers the 'long script' warning). ...
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Remove a string from the beginning of a string

I have a string that looks like this: 11 Answers 11 ...
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Maintain aspect ratio of div but fill screen width and height in CSS?

I have a site to put together that has a fixed aspect ratio of approximately 16:9 landscape, like a video. 9 Answers ...