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How can I display just a portion of an image in HTML/CSS?

... a way to display just the the center 50x50px of an image that's 250x250px in HTML. How can I do that. Also, is there a way to do this for css:url() references? ...
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Rails 3 migrations: Adding reference column?

... If you are using the Rails 4.x you can now generate migrations with references, like this: rails generate migration AddUserRefToProducts user:references like you can see on rails guides ...
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Specifying column name in a “references” migration

I want to make a migration in Rails, referencing another table. Usually, I would do something like: 6 Answers ...
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Customizing the template within a Directive

I have a form that is using markup from Bootstrap, like the following: 4 Answers 4 ...
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Why does JPA have a @Transient annotation?

Java has the transient keyword. Why does JPA have @Transient instead of simply using the already existing java keyword? ...
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Setting HttpContext.Current.Session in a unit test

I have a web service I am trying to unit test. In the service it pulls several values from the HttpContext like so: 14 A...
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How to get nice formatting in the Rails console

I want to get something like this to look nice: 12 Answers 12 ...
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querySelector and querySelectorAll vs getElementsByClassName and getElementById in JavaScript

...xactly is the difference between querySelector and querySelectorAll against getElementsByClassName and getElementById ? ...
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Unable to set data attribute using jQuery Data() API

I've got the following field on an MVC view: 7 Answers 7 ...
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I need to securely store a username and password in Python, what are my options?

I'm writing a small Python script which will periodically pull information from a 3rd party service using a username and password combo. I don't need to create something that is 100% bulletproof (does 100% even exist?), but I would like to involve a good measure of security so at the very least it w...