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What is the mouse down selector in CSS?

I have noticed that buttons and other elements have a default styling and behave in 3 steps: normal view, hover/focus view and mousedown/click view, in CSS I can change the styling of normal view and hover view like this: ...
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How do I manipulate a variable whose name conflicts with PDB commands?

My code is, for better or worse, rife with single letter variables (it's physics stuff, so those letters are meaningful), as well as NumPy's, which I'm often interacting with. ...
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How to forward declare a C++ template class?

Given a template class like the following: 3 Answers 3 ...
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How to get the PATH environment-variable separator in Python?

When multiple directories need to be concatenated, as in an executable search path, there is an os-dependent separator character. For Windows it's ';' , for Linux it's ':' . Is there a way in Python to get which character to split on? ...
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Disable vertical scroll bar on div overflow: auto

Is it possible to allow only a horizontal scroll bar when using overflow:auto (or scroll)? 8 Answers ...
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Unsigned keyword in C++

Does the unsigned keyword default to a specific data type in C++? I am trying to write a function for a class for the prototype: ...
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Is JSON Hijacking still an issue in modern browsers?

I am using Backbone.js and the Tornado web server. The standard behavior for receiving collection data in Backbone is to send as a JSON Array. ...
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Is there a portable way to print a message from the C preprocessor?

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error upon assigning Layout: BoxLayout can't be shared

I have this Java JFrame class, in which I want to use a boxlayout, but I get an error saying java.awt.AWTError: BoxLayout can't be shared . I've seen others with this problem, but they solved it by creating the boxlayout on the contentpane, but that is what I'm doing here. Here's my code: ...
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Difference between java.exe and javaw.exe

Recently I noted that some applications are running on javaw (not in java ). What is the difference between them and how can I run my Swing application on javaw ? ...