<pclass="arguement"><strong>duration</strong>A string or number determining how long the animation will run.</p>
<pclass="arguement"><strong>callback</strong>A function to call once the animation is complete.</p>
</li></ul>
<divclass="longdesc">
<p>The <code>.slideDown()</code> method animates the height of the matched elements. This causes lower parts of the page to slide down, making way for the revealed items.</p>
<p>Durations are given in milliseconds; higher values indicate slower animations, not faster ones. The strings <code>'fast'</code> and <code>'slow'</code> can be supplied to indicate durations of <code>200</code> and <code>600</code> milliseconds, respectively. If any other string is supplied, or if the <code>duration</code> parameter is omitted, the default duration of <code>400</code> milliseconds is used.</p>
<p>If supplied, the callback is fired once the animation is complete. This can be useful for stringing different animations together in sequence. The callback is not sent any arguments, but <code>this</code> is set to the DOM element being animated. If multiple elements are animated, it is important to note that the callback is executed once per matched element, not once for the animation as a whole.</p>
<p>We can animate any element, such as a simple image:</p>
<h4>Example: <spanclass="desc">Animates all inputs to slide down, completing the animation within 1000 milliseconds. Once the animation is done, the input look is changed especially if it is the middle input which gets the focus.</span>
