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What is aria-label and how should I use it?

...log.close()">X</button>` Most people would be able to infer visually that this button will close the dialog. A blind person using assistive technology might just hear "X" read aloud, which doesn't mean much without the visual clues. aria-label explicitly tells them what the button will do...
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Argparse: Required argument 'y' if 'x' is present

... No, there isn't any option in argparse to make mutually inclusive sets of options. The simplest way to deal with this would be: if args.prox and (args.lport is None or args.rport is None): parser.error("--prox requires --lport and --rport.") ...
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Singleton pattern in nodejs - is it needed?

... This has basically to do with nodejs caching. Plain and simple. https://nodejs.org/api/modules.html#modules_caching (v 6.3.1) Caching Modules are cached after the first time they are loaded. This means (among other things) tha...
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Deploying website: 500 - Internal server error

..., because this is a general message without giving information on what's really happening for security reasons. With the detailed error, you can locate the real issue here. Also, if you can run the browser on the server, you get details on the error, because the server recognizes that you are loca...
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Asp.net 4.0 has not been registered

... For those getting this error in after installing .NET Framework 4.6 - Read and install one of these hotfixes to resolve the issue. share | improve this answer ...
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onSaveInstanceState () and onRestoreInstanceState ()

... Usually you restore your state in onCreate(). It is possible to restore it in onRestoreInstanceState() as well, but not very common. (onRestoreInstanceState() is called after onStart(), whereas onCreate() is called before onStar...
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Set icon for Android application

...e Assets → select launcher icon → choose image file. It will automatically re-size. Done! share | improve this answer | follow | ...
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How to define custom exception class in Java, the easiest way?

...nstructors, you need to define the one taking a String in your class. Typically you use super(message) in your constructor to invoke your parent constructor. For example, like this: public class MyException extends Exception { public MyException(String message) { super(message); } }...
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How to create UILabel programmatically using Swift?

How do I create a UILabel programmatically using Swift in Xcode 6? 12 Answers 12 ...
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Adding external library in Android studio

...nspecting.... But there are docs available : developer.android.com/sdk/installing/studio-build.html – malcubierre Sep 2 '14 at 6:28 26 ...