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In CSS what is the difference between “.” and “#” when declaring a set of styles?
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# is an id selector, used to target a single specific element with a unique id, but . is a class selector used to target multiple elements with a particular class. To put it another way:
#foo {} will style the single element declared with an attribute id="foo"
.foo {} will style all el...
An algorithm for inflating/deflating (offsetting, buffering) polygons
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While Clipper is primarily designed for polygon clipping operations, it does polygon offsetting too. The library is open source freeware written in Delphi, C++ and C#. It has a very unencumbered Boost license allowing it to be used in both freeware and commercial applications without charge.
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Clear file cache to repeat performance testing
... to prevent my performance results from being skewed? I believe I need to either completely clear, or selectively remove cached information about file and directory contents.
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How to style the parent element when hovering a child element?
I know that there does not exist a CSS parent selector , but is it possible to style a parenting element when hovering a child element without such a selector?
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How to get a time zone from a location using latitude and longitude coordinates?
... on StackOverflow about resolving a time zone from a location. This community wiki is an attempt at consolidating all of the valid responses.
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Delete all Duplicate Rows except for One in MySQL? [duplicate]
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Editor warning: This solution is computationally inefficient and may bring down your connection for a large table.
NB - You need to do this first on a test copy of your table!
When I did it, I found that unless I also includ...
How to prevent rm from reporting that a file was not found?
I am using rm within a BASH script to delete many files. Sometimes the files are not present, so it reports many errors. I do not need this message. I have searched the man page for a command to make rm quiet, but the only option I found is -f , which from the description, "ignore nonexistent f...
How do I log a Python error with debug information?
I am printing Python exception messages to a log file with logging.error :
12 Answers
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Why does installing Nokogiri on Mac OS fail with libiconv is missing?
...okogiri on Mac OS 10.9.3 and whatever I try, the install fails in the end with the following error message:
33 Answers
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How do I show a marker in Maps launched by geo URI Intent?
...ocations (one at the time, picked by user input) by launching Google Maps with their specific geo coordinates.
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