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How can I display just a portion of an image in HTML/CSS?

Let's say I want a way to display just the the center 50x50px of an image that's 250x250px in HTML. How can I do that. Also, is there a way to do this for css:url() references? ...
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How to validate an email address using a regular expression?

... +50 The fully RFC 822 compliant regex is inefficient and obscure because of its length. Fortunately, RFC 822 was superseded twice and the...
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Version vs build in Xcode

...d deployment target. The version field is blank and the build field is 3.4.0 (which matches the version of the app from when I was still editing with Xcode 3). ...
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How to send POST request?

...: 'issue', 'action': 'show'}) >>> print(r.status_code, r.reason) 200 OK >>> print(r.text[:300] + '...') <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml...
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ConnectionTimeout versus SocketTimeout

... RobertRobert 31.5k1313 gold badges8080 silver badges122122 bronze badges 1 ...
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Get all child views inside LinearLayout at once

...earLayout ll = … final int childCount = ll.getChildCount(); for (int i = 0; i < childCount; i++) { View v = ll.getChildAt(i); // Do something with v. // … } share | improve...
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R data formats: RData, Rda, Rds etc

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Check if a given Type is an Enum

... Ry-♦Ry- 192k4444 gold badges392392 silver badges404404 bronze badges 63 ...
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Return two and more values from a method

... 160 def sumdiff(x, y) return x+y, x-y end #=> nil sumdiff(3, 4) #=> [7, -1] a = sumdiff(3,...
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jQuery show for 5 seconds then hide

...n use .delay() before an animation, like this: $("#myElem").show().delay(5000).fadeOut(); If it's not an animation, use setTimeout() directly, like this: $("#myElem").show(); setTimeout(function() { $("#myElem").hide(); }, 5000); You do the second because .hide() wouldn't normally be on the an...