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# Hammer.js 2.0.6
[](https://travis-ci.org/hammerjs/hammer.js)
## Support, Questions, and Collaboration
[](https://hammerjs.herokuapp.com/)
## Documentation
Visit [hammerjs.github.io](http://hammerjs.github.io) for detailed documentation.
```js
// get a reference to an element
var stage = document.getElementById('stage');
// create a manager for that element
var mc = new Hammer.Manager(stage);
// create a recognizer
var Rotate = new Hammer.Rotate();
// add the recognizer
mc.add(Rotate);
// subscribe to events
mc.on('rotate', function(e) {
// do something cool
var rotation = Math.round(e.rotation);
stage.style.transform = 'rotate('+rotation+'deg)';
});
```
## Contributing
Read the [contributing guidelines](./CONTRIBUTING.md).
For PRs.
- Use [Angular Style commit messages](https://github.com/angular/angular.js/blob/v1.4.8/CONTRIBUTING.md#commit)
- Rebase your PR branch when necessary
- If you add a feature or fix a bug, please add or fix any necessary tests.
- If a new feature, open a docs PR to go with.
## Building
You can get the pre-build versions from the Hammer.js website, or do this by yourself running
`npm install -g grunt-cli && npm install && grunt build`
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