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How to change border color of textarea on :focus

Forgive me is this is a stupid question, but i need help. I want to change border color of TEXTAREA on focus. but my code doesn't seem to working properly. ...
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How to sort a list in Scala by two fields?

how to sort a list in Scala by two fields, in this example I will sort by lastName and firstName? 4 Answers ...
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How to position a DIV in a specific coordinates?

I want to position a DIV in a specific coordinates ? How can I do that using Javascript ? 6 Answers ...
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Simplest way to detect a mobile device in PHP

What is the simplest way to tell if a user is using a mobile device to browse my site using PHP? 15 Answers ...
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Representing and solving a maze given an image

What is the best way to represent and solve a maze given an image? 10 Answers 10 ...
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Accessing the index in 'for' loops?

How do I access the index in a for loop like the following? 20 Answers 20 ...
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Number of lines in a file in Java

I use huge data files, sometimes I only need to know the number of lines in these files, usually I open them up and read them line by line until I reach the end of the file ...
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RGB to hex and hex to RGB

How to convert colors in RGB format to hex format and vice versa? 50 Answers 50 ...
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How to change plot background color?

I am making a scatter plot in matplotlib and need to change the background of the actual plot to black. I know how to change the face color of the plot using: ...
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Check if an array is empty or exists

When the page is loading for the first time, I need to check if there is an image in image_array and load the last image. ...