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Stopping fixed position scrolling at a certain point?

I have an element that is position:fixed and so scrolls with the page how i want it to however. when the user scrolls up I want the element to stop scrolling at a certain point, say when it is 250px from the top of the page, is this possible? Any help or advice would be helpful thanks! ...
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Git diff to show only lines that have been modified

When I do a git diff, it shows lines that have been added: 7 Answers 7 ...
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Eclipse “Error: Could not find or load main class”

I have a project in eclipse on my laptop that I pushed to Git https://github.com/chrisbramm/LastFM-History-Graph.git 50 An...
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How do I make XAML DataGridColumns fill the entire DataGrid?

I am using DataGrids in XAML (not Silverlight) with resizable columns, the DataGrid will expand if the user resizes the screen. ...
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How to find what code is run by a button or element in Chrome using Developer Tools

I'm using Chrome and my own website. 5 Answers 5 ...
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Git hangs while writing objects

I'm trying to git push -u origin master And it just hangs at 9 Answers 9 ...
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How to check if an email address exists without sending an email?

I have come across this PHP code to check email address using SMTP without sending an email . 14 Answers ...
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What is the difference between iterator and iterable and how to use them?

I am new in Java and I'm really confused with iterator and iterable. Can anyone explain to me and give some examples? 13 An...
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Make absolute positioned div expand parent div height

As you can see in the CSS below, I want child2 to position itself before child1 . This is because the site I'm currently developing should also work on mobile devices, on which the child2 should be at the bottom, as it contains the navigation which I want below the content on the mobile devices...
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Best way to merge two maps and sum the values of same key?

I want to merge them, and sum the values of same keys. So the result will be: 15 Answers ...