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    Prototype JavaScript framework
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    An object-oriented JavaScript framework

    Prototype is a JavaScript framework that aims to ease development of dynamic web applications. It offers a familiar class-style OO framework, extensive Ajax support, higher-order programming constructs, and easy DOM manipulation.

    Targeted platforms

    Prototype currently targets the following platforms:

    • Microsoft Internet Explorer for Windows, version 6.0 and higher
    • Mozilla Firefox 1.5 and higher
    • Apple Safari 2.0.4 and higher
    • Opera 9.25 and higher
    • Chrome 1.0 and higher

    Using Prototype

    To use Prototype in your application, download the latest release from the Prototype web site ( and copy dist/prototype.js to a suitable location. Then include it in your HTML like so:

    <script type="text/javascript" src="/path/to/prototype.js"></script>

    Building Prototype from source

    prototype.js is a composite file generated from many source files in the src/ directory. To build Prototype, you'll need:

    • a copy of the Prototype source tree, either from a distribution tarball or from the Git repository (see below)
    • Ruby 1.8.2 or higher (
    • Rake--Ruby Make (
    • RDoc, if your Ruby distribution does not include it

    From the root Prototype directory:

    • rake dist will preprocess the Prototype source using Sprockets and generate the composite dist/prototype.js
    • rake package will create a distribution tarball in the pkg/ directory

    Contributing to Prototype

    Check out the Prototype source with

    $ git clone git://
    $ cd prototype
    $ git submodule init
    $ git submodule update vendor/sprockets vendor/pdoc vendor/unittest_js

    Find out how to contribute:


    Please see the online Prototype API:

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