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What is the difference between id and class in CSS, and when should I use them? [duplicate]

... of "comments" or a certain list style to use for related links. Additionally, a given element can have more than one class associated with it, while an element can only have one id. For example, you can give a div two classes whose styles will both take effect. Furthermore, note that classes are...
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Authentication issue when debugging in VS2013 - iis express

...n. These settings control what authentication mechanisms the web sites are allowed to use. – chiccodoro Feb 11 '14 at 16:22 ...
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When does System.gc() do something?

...hat garbage collection is automated in Java. But I understood that if you call System.gc() in your code that the JVM may or may not decide to perform garbage collection at that point. How does this work precisely? On what basis/parameters exactly does the JVM decide to do (or not do) a GC when it ...
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How can I measure the similarity between two images? [closed]

...is is just to do the following steps to each image: scale to something small, like 64x64 or 32x32, disregard aspect ratio, use a combining scaling algorithm instead of nearest pixel scale the color ranges so that the darkest is black and lightest is white rotate and flip the image so that the ligh...
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How can I make a .NET Windows Forms application that only runs in the System Tray?

...of creating an application that only ever exists in the System Tray. Basically change the Application.Run(new Form1()); line in Program.cs to instead start up a class that inherits from ApplicationContext, and have the constructor for that class initialize a NotifyIcon static class Program { /...
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Shortcuts in Objective-C to concatenate NSStrings

...option has many upvotes, I think this is the best answer if you don't know all your strings upon construction. Every time you append a string, you're creating a lot of overhead. Using a mutable string removes that problem. – Eli Dec 22 '09 at 1:25 ...
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Order Bars in ggplot2 bar graph

...rder. If left unspecified, the levels of a factor will be sorted alphabetically. You can also specify the level order within the call to factor as above, and other ways are possible as well. theTable$Position <- factor(theTable$Position, levels = c(...)) ...
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what is Promotional and Feature graphic in Android Market/Play Store?

...Tips: Use a safe frame of 924x400 (50 pixel of safe padding on each side). All the important content of the graphic should be within this safe frame. Pixels outside of this safe frame may be cropped for stylistic purposes. If incorporating text, use large font sizes, and keep the graphic simple, as ...
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How to Execute a Python File in Notepad ++?

... this calls cmd window. can we call powershell instead? – Enthusiastic Engineer Nov 10 '19 at 8:31 add a co...
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What is trunk, branch and tag in Subversion? [duplicate]

...oduct, like having a place to backport bugfixes into a stable release. Finally, tags are markers to highlight notable revisions in the history of the repository, usually things like "this was released as 1.0". See the HTML version of "Version Control with Subversion", especially Chapter 4: Branchi...