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. By default jQuery is accessed via the globally defined function "$" (though "jQuery" should also work).

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 "quote" have a pink background, and a larger text size:

$("p.quote").css({background:  "pink", font-size: "larger"});

http://jquery.org