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What is the purpose and use of **kwargs?

What are the uses for **kwargs in Python? 13 Answers 13 ...
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Change an HTML5 input's placeholder color with CSS

Chrome supports the placeholder attribute on input[type=text] elements (others probably do too). 37 Answers ...
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Unable to understand useCapture parameter in addEventListener

I have read article at https://developer.mozilla.org/en/DOM/element.addEventListener but unable to understand useCapture attribute. Definition there is: ...
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Why do Twitter Bootstrap tables always have 100% width?

Suppose this markup: 6 Answers 6 ...
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Get selected value/text from Select on change

I need to get the value of the selected option in javascript: does anyone know how to get the selected value or text, please tell how to write a function for it. I have assigned onchange() function to select so what do i do after that? ...
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How to clear https proxy setting of NPM?

How can I clear the previous ssl proxy setting of NPM? well, I search a lot, but all post I got is mainly about how to set proxy in corporate network. ...
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How do I print a list of “Build Settings” in Xcode project?

Is there a Canonical list of Xcode Environment Variables that can be used in Build Rules etc? 7 Answers ...
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How to convert timestamps to dates in Bash?

I need a shell command or script that converts a Unix timestamp to a date. The input can come either from the first parameter or from stdin, allowing for the following usage patterns: ...
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In what order are Panels the most efficient in terms of render time and performance?

There are many times when more than one panel would suitable for the layout I want, however I know there is a difference in render times for different panel types. ...
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Why is Scala's immutable Set not covariant in its type?

EDIT : Re-written this question based on original answer 3 Answers 3 ...