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Basics
The button classes described here can be applied to any element, although typically would be applied to an element like a, input[type="submit"] or button so that the user can interact with it.
As a minimum, a button should receive the basic ipsButton class, plus a size class and a style class (explained below).
 
Button styles
ipsButton_normal
Normal button ipsButton_primary
Primary button ipsButton_alternate
Alternate button ipsButton_important
Important button ipsButton_light
Light button ipsButton_veryLight
Very light button ipsButton_overlaid
Overlaid button ipsButton_link
Link button  
Button sizes
ipsButton_medium
Medium button ipsButton_verySmall
Very small button ipsButton_small
Small button ipsButton_large
Large button ipsButton_veryLarge
Very large button ipsButton_fullWidth
Can be combined with another size, above.
Full width button  
Disabled buttons
Buttons can be visually disabled either by adding the class ipsButton_disabled, or, on relevant input elements, adding the disabled property. For example:
<a href='#' class='ipsButton ipsButton_normal ipsButton_medium ipsButton_disabled'>Disabled button (link)</a> <input type='submit' class='ipsButton ipsButton_normal ipsButton_medium' disabled value='Disabled button (input)'> These would render like so:
Disabled button (link)  
Split buttons
Split buttons allow you to create toolbars easily by specifying a list of buttons that display joined to each other.
They are created by specifying the class ipsButton_split on a wrapper element containing two or more buttons. The wrapper element can be a <ul> tag, or any other that makes sense for your use.
All of the buttons in a split button group should be the same size, otherwise results are unpredictable. Different styles can be used on each button, though.
<ul class='ipsButton_split'> <li><a href='#' class='ipsButton ipsButton_small ipsButton_primary'>Button 1</a></li> <li><a href='#' class='ipsButton ipsButton_small ipsButton_light'>Button 2</a></li> <li><a href='#' class='ipsButton ipsButton_small ipsButton_light'>Button 3</a></li> </ul> Button 1 Button 2 Button 3