JQuery

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JQuery is a JavaScript popular framework. It smooths over many of the difficulties that traditionally made JavaScript hard to work with and supports / encourages a unique style of coding driven by CSS-selector based "queries". JQuery code can be surprisingly compact.

For example, to hide all the links (in anchor tags) on a page, you could simply write:

$("a").hide();

Or to make all paragraphs of class "side" have a pink background:

$("p.side").css({background:  "pink"});

http://jquery.org