# jQuery.isWindow()

## jQuery.isWindow ( obj ) Returns: boolean version added: 1.4.3

- obj
  Type: PlainObject
  Object to test whether or not it is a window.

Description: Determine whether the argument is a window.

This is used in a number of places in jQuery to determine if we're operating against a browser window (such as the current window or an iframe).

## Examples:

#### Example: Finds out if the parameter is a window.

    <!doctype html>
    <html lang="en">
    <head>
      <meta charset="utf-8">
      <title>css demo</title>

      <script src="//code.jquery.com/jquery-1.10.2.js"></script>
    </head>
    <body>

    Is 'window' a window? <b></b>

    <script>

    $( "b" ).append( "" + $.isWindow( window ) );

    </script>

    </body>
    </html>

#### Demo: