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    <p>I found a rational (if intricate) explanation for your bug.</p> <p>The root cause : you are using a <code>jquery-ui</code> effect (not a basic <code>jquery</code> effect), and you add elements after last inserted item, before the animation has finished.<br> The gotcha : jquery-ui uses wrappers during its animations, and if a wrapper is already present, it reuses it.</p> <p>Here is the detailed walkthrough :</p> <ul> <li>When animating the first item : for the duration of the effect, the item is wrapped in a div with class <code>ui-effects-wrapper</code>, and this wrapper div is animated to give the <code>blind</code> effect</li> <li>When adding the second item : adding it after "last" (&lt;- in this case : the first item) actually adds it inside the wrapper. </li> <li>When animating the second item: jquery-ui reuses the existing wrapper (shortcut in <code>createWrapper</code>, see below)</li> <li>Same goes for items 3-5</li> <li>When first animation ends, the wrapper element is removed and replaced whith the first animated elements. The other elements (remember : they were attached as children of this wrapper) end up dangling with no parent.</li> </ul> <p>Relevant pieces of code :<br> <a href="https://github.com/jquery/jquery-ui/blob/9470af0bbefafa3d81c3709674a45a54b693e7cf/ui/jquery.ui.effect-blind.js#L21" rel="nofollow noreferrer">jquery-ui code : snippet 1 - <code>blind()</code> function</a><br> <a href="https://github.com/jquery/jquery-ui/blob/9470af0bbefafa3d81c3709674a45a54b693e7cf/ui/jquery.ui.effect.js#L959" rel="nofollow noreferrer">jquery-ui code : snippet 2 - <code>createWrapper()</code> inner function</a><br> <a href="https://github.com/jquery/jquery-ui/blob/9470af0bbefafa3d81c3709674a45a54b693e7cf/ui/jquery.ui.effect-blind.js#L75" rel="nofollow noreferrer">jquery-ui code : snippet 3 - <code>blind()</code> code when animation completes</a> </p> <p>I don't think this should be considered as a jquery-ui bug - your use case is, IMHO, pretty isolate, and I wouldn't imagine what "correcting" this would trigger elsewhere.</p> <p>Solutions :</p> <ul> <li><code>slideDown</code> will work (<a href="http://jsfiddle.net/AN3ft/4/" rel="nofollow noreferrer">fiddle</a> - it animates the element, no wrapper there)</li> <li>add a <code>&lt;span id="beacon"&gt;&lt;/span&gt;</code> item and insert new elements <em>before</em> <code>#beacon</code></li> <li><a href="https://stackoverflow.com/a/18955256/86072">A. Wolff's solution</a></li> <li>as you already found out, <code>.append()</code> on a common container</li> </ul>
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    1. POjQuery show() fail with last(), after() and "blind" effect
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