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+# jQuery Mouse Wheel Plugin
+
+A [jQuery](http://jquery.com/) plugin that adds cross-browser mouse wheel support with delta normalization.
+
+In order to use the plugin, simply bind the `mousewheel` event to an element.
+
+It also provides two helper methods called `mousewheel` and `unmousewheel`
+that act just like other event helper methods in jQuery.
+
+The event object is updated with the normalized `deltaX` and `deltaY` properties.
+In addition there is a new property on the event object called `deltaFactor`. Multiply
+the `deltaFactor` by `deltaX` or `deltaY` to get the scroll distance that the browser
+has reported.
+
+Here is an example of using both the bind and helper method syntax:
+
+```js
+// using on
+$('#my_elem').on('mousewheel', function(event) {
+    console.log(event.deltaX, event.deltaY, event.deltaFactor);
+});
+
+// using the event helper
+$('#my_elem').mousewheel(function(event) {
+    console.log(event.deltaX, event.deltaY, event.deltaFactor);
+});
+```
+
+The old behavior of adding three arguments (`delta`, `deltaX`, and `deltaY`) to the
+event handler is now deprecated and will be removed in later releases.
+
+
+## The Deltas...
+
+The combination of Browsers, Operating Systems, and Devices offer a huge range of possible delta values. In fact if the user
+uses a trackpad and then a physical mouse wheel the delta values can differ wildly. This plugin normalizes those
+values so you get a whole number starting at +-1 and going up in increments of +-1 according to the force or
+acceleration that is used. This number has the potential to be in the thousands depending on the device.
+Check out some of the data collected from users [here](http://mousewheeldatacollector.herokuapp.com/).
+
+### Getting the scroll distance
+
+In some use-cases we prefer to have the normalized delta but in others we want to know how far the browser should
+scroll based on the users input. This can be done by multiplying the `deltaFactor` by the `deltaX` or `deltaY`
+event property to find the scroll distance the browser reported.
+
+The `deltaFactor` property was added to the event object in 3.1.5 so that the actual reported delta value can be
+extracted. This is a non-standard property.
+
+
+## Using with [Browserify](http://browserify.org)
+
+Support for browserify is baked in.
+
+```bash
+npm install jquery-mousewheel
+npm install jquery-browserify
+```
+
+In your server-side node.js code:
+
+```js
+var express = require('express');
+var app = express.createServer();
+
+app.use(require('browserify')({
+    require : [ 'jquery-browserify', 'jquery-mousewheel' ]
+}));
+```
+
+In your browser-side javascript:
+
+```js
+var $ = require('jquery-browserify');
+require('jquery-mousewheel')($);
+```