What can xpath evaluate that querySelector can't? [closed] - javascript

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I've heard (XPath or querySelector?) that XPath (evaluate) can do everything that a CSS3 selector (querySelector) can and even more, but couldn't find what exactly "more" it can do, can you list what exactly is "more"?

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Given an array of integers, find the one that appears an odd number of times [closed]

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There will always be only one integer that appears an odd number of times.

what does line of code mean: inputArray[0] [closed]

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I am trying to understand what it means when a code appears in between the brackets. I know that has something to do with an array.
In the case of "inputArray[0]", it is finding the value at index position 0 (the first element) in the array "inputArray".

6 character only print for input field after remove letter spacing [duplicate]

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Position sticky is not yet been utilized in all browsers, but I saw some browsers using sticky position.
Is there a way for it to implement across older-browsers (IE 7+) ?

How to do Javascript and jQuery Code Review [closed]

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Can anybody let me know how is Code Review done for the javascript or jQuery Code. What are the points that are to be strictly checked in Code Reviews.
Thanks
You might want to try out http://jshint.com/ and follow this: http://javascript.crockford.com/code.html

Use eval in a restricted scope [closed]

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OK, let me explain what I need:
I want the user to be able to eval his own valid JS/jQuery statements
Access to elements must be restricted - meaning: let's say object X should not be available, but object Y should.
How should I go about that?

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