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How do I add a tool tip to a span element?

In the following code, I want a tool-tip to come up when the user hovers the span, how do I do that? I don't want to use any links. ...
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How to specialize std::hash::operator() for user-defined type in unordered containers?

...lt;Key, Value> one has to provide operator==(Key, Key) and a hash functor: 3 Answers ...
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What is Android keystore file, and what is it used for?

This is a general question, but particularly I am interested in it's use for Android. What is a keystore file, and what is it used for? ...
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how to provide a swap function for my class?

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How to link godaddy domain with AWS Elastic Beanstalk environment?

...ng into this problem trying to link my Godaddy domain with an AWS Elastic Beanstalk instance . I found a lot of documentation on how to link an EC2 instance with a domain on Godaddy but not for Elastic Beanstalk instance. So I ended up with this URL: www.MY_SITE.elasticbeanstalk.com ...
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How to undo 'git reset'?

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Why are C# 4 optional parameters defined on interface not enforced on implementing class?

I noticed that with the optional parameters in C# 4 if you specify an optional parameter on an interface you don,t have to make that parameter optional on any implementing class: ...
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What is a proper naming convention for MySQL FKs?

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How to stage only part of a new file with git?

I love git add --interactive . It is now part of my daily workflow. 5 Answers 5 ...
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Is there a benefit to defining a class inside another class in Python?

What I'm talking about here are nested classes. Essentially, I have two classes that I'm modeling. A DownloadManager class and a DownloadThread class. The obvious OOP concept here is composition. However, composition doesn't necessarily mean nesting, right? ...