# Yahoo! UI Library

### io 3.0.0

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

Base IO functionality. Provides basic XHR transport support.

This module contains the following classes:

- io

#### Submodules:

`io-base`
  Base IO functionality. Provides basic XHR transport support.
`io-queue`
  Extends the IO base class to implement Queue for synchronous transaction processing.
`io-upload-iframe`
  Extends the IO base class to enable file uploads, with HTML forms, using an iframe as the transport medium.
`io-xdr`
  Extends the IO base class to provide an alternate, Flash transport, for making cross-domain requests.
`io-form`
  Extends the IO base class to enable HTML form data serialization, when specified in the transaction's configuration object.

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