The step property is a decimal value, in the range from 0 to 1, which determines the portion of the star or symbol, which will be colorized, when the user hovers over it.
For example, if set to 1, a complete star or symbol will be colored upon hover.
The default value is 1.

The code snippet below demonstrates one possible use:

<div id="rating"></div>

<script type="text/javascript">
jQuery(function($) {
        step: 0.3,
        value: 3,
        markPreset: false