# Yahoo! UI Library

### history 3.3.0

Yahoo! UI Library > history
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### Module: history

Provides browser history management functionality using a simple add/replace/get paradigm. This can be used to ensure that the browser's back and forward buttons work as the user expects and to provide bookmarkable URLs that return the user to the current application state, even in an Ajax application that doesn't perform full-page refreshes.

This module contains the following classes:

- HistoryBase
- HistoryHash
- HistoryHTML5

#### Submodules:

`history-base`
  Provides global state management backed by an object, but with no browser history integration. For actual browser history integration and back/forward support, use the history-html5 or history-hash modules.
`history-hash-ie`
  Improves IE6/7 support in history-hash by using a hidden iframe to create entries in IE's browser history. This module is only needed if IE6/7 support is necessary; it's not needed for any other browser.
`history-hash`
  Provides browser history management backed by `window.location.hash`, as well as convenience methods for working with the location hash and a synthetic `hashchange` event that normalizes differences across browsers.
`history-html5`
  Provides browser history management using the HTML5 history API.

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