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Margin-Top push outer div down

I have a header div as the first element in my wrapper div, but when I add a top margin to a h1 inside the header div it pushes the entire header div down. I realize this happens whenever I apply a top margin to the first visible element on a page. ...
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How do I tell CPAN to install all dependencies?

How do I tell CPAN to install all dependencies? 10 Answers 10 ...
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Why shouldn't I use mysql_* functions in PHP?

What are the technical reasons for why one shouldn't use mysql_* functions? (e.g. mysql_query() , mysql_connect() or mysql_real_escape_string() )? ...
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What are the dark corners of Vim your mom never told you about? [closed]

There are a plethora of questions where people talk about common tricks, notably " Vim+ctags tips and tricks ". 70 Answers ...
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Span inside anchor or anchor inside span or doesn't matter?

I want to nest span and a tags. Should I 10 Answers 10 ...
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Dynamic LINQ OrderBy on IEnumerable / IQueryable

I found an example in the VS2008 Examples for Dynamic LINQ that allows you to use a sql-like string (e.g. OrderBy("Name, Age DESC")) for ordering. Unfortunately, the method included only works on IQueryable<T> . Is there any way to get this functionality on IEnumerable<T> ? ...
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Can I export a variable to the environment from a bash script without sourcing it?

Suppose that I have this script 7 Answers 7 ...
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Error: Can't set headers after they are sent to the client

I'm fairly new to Node.js and I am having some issues. 32 Answers 32 ...
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Scrolling child div scrolls the window, how do I stop that?

I have a div, with a scroll bar, When it reaches the end, my page starts scrolling. Is there anyway I can stop this behavior ? ...
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Understand convertRect:toView:, convertRect:FromView:, convertPoint:toView: and convertPoint:fromVie

I'm trying to understand the functionalities of these methods. Could you provide me a simple usecase to understand theirs semantics? ...