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    <p>$("div") => Selects all div elements $(".yes") => Selects all elements which have class name "yes" $("#elementId") => Selects element which Id value is "elementId"</p> <pre><code>$("div .yes") =&gt;Selects elements under div element (all the descendants) and have class name "yes" $("div &gt; .yes") =&gt;Selects elements right under div elements. Not all descendants, just direct children </code></pre> <p>Hope it helps.</p> <p>For example <code>$("li div[class=yes] input")</code> will select :</p> <pre><code>&lt;div class="yes"&gt;&lt;input type="radio" name="Group 1"&gt;&lt;/div&gt; &lt;div class="yes"&gt;&lt;input type="radio" name="Item 1"&gt;&lt;/div&gt; &lt;div class="yes"&gt;&lt;input type="radio" name="Item 2"&gt;&lt;/div&gt; &lt;div class="yes"&gt;&lt;input type="radio" name="Group 2"&gt;&lt;/div&gt; &lt;div class="yes"&gt;&lt;input type="radio" name="Group 5"&gt;&lt;/div&gt; &lt;div class="yes"&gt;&lt;input type="radio" name="Item 3"&gt;&lt;/div&gt; &lt;div class="yes"&gt;&lt;input type="radio" name="Item 4"&gt;&lt;/div&gt; </code></pre> <p>For more information, you can check jQuery Selectors : <a href="http://docs.jquery.com/Selectors" rel="nofollow noreferrer">http://docs.jquery.com/Selectors</a></p> <p>or The best book is jQuery in Action, well I am learning from this book :)</p> <p>Select sibling elements of li : <code>$("li")</code></p> <p>P.s : In normal javascript $() means <code>getElementById()</code> but it works a little bit different in jQuery because jQuery power comes from its selectors, it uses Css selectors as well as its own custom and powerful selectors.</p>
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