Change the color of all divs; then add a border to those with a "middle" class.
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Демонстрация:
Change the color of all divs; then add a border to the second one (index == 1) and the div with an id of "fourth."
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Демонстрация:
Select all divs and filter the selection with a DOM element, keeping only the one with an id of "unique".
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Select all divs and filter the selection with a jQuery object, keeping only the one with an id of "unique".
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