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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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What does `:_*` (colon underscore star) do in Scala?

I have the following piece of code from this question : 4 Answers 4 ...
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When using the Java debugger in Intellij what does “Drop Frame” mean?

I was using the Java debugger within Intellij 8 and noticed a button labeled "drop frame", does anybody know what purpose this serves? How/why would this be used/useful? ...
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What is the @Html.DisplayFor syntax for?

I understand that in Razor, @Html does a bunch of neat things, like generate HTML for links, inputs, etc. 4 Answers ...
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What does a tilde in angle brackets mean when creating a Java generic class?

I was reading through some JMockit examples and found this code: 4 Answers 4 ...
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Making an iframe responsive

I was reading this stackoverflow post titled "Can you make an iFrame responsive?", and one of the comments/answers led me to this jfiddle. ...
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How to empty/destroy a session in rails?

I can't seem to find it anywhere... How do I delete/destroy/reset/empty/clear a user's session in Rails? Not just one value but the whole thing.. ...
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How do I show an open file in eclipse Package Explorer?

When a file (.java for example) is open in Eclipse, how do I get the Package Explorer to show the file that I am working on? ...
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Return Boolean Value on SQL Select Statement

How to return a boolean value on SQL Select Statement? 9 Answers 9 ...
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How to make CSS width to fill parent?

I am sure this problem has been asked before but I cannot seem to find the answer. 4 Answers ...