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    <p><strong>Edit:</strong> Since you need this for a FF extension you can skip all the functions for IE and everything you need to do is this:</p> <pre><code>window.getSelection().getRangeAt(0).commonAncestorContainer </code></pre> <p>More information about Ranges: <a href="https://developer.mozilla.org/en/DOM/range" rel="nofollow noreferrer">https://developer.mozilla.org/en/DOM/range</a></p> <hr> <p>There already is a similar question:</p> <p><a href="https://stackoverflow.com/questions/361130/get-selected-text-and-selected-nodes-on-a-page/364476#364476">Get selected text and selected nodes on a page?</a></p> <p>I modified the functions a bit:</p> <pre><code>&lt;script type="text/javascript"&gt; function getTextSelection() { if(document.selection) return document.selection; else if(window.getSelection) return window.getSelection(); else if(document.getSelection) return document.getSelection(); else return false; } function getSelectionRange() { var selection = getTextSelection(); if(selection.getRangeAt) return selection.getRangeAt(0); else if (selection.createRange) return selection.createRange(); else return false; } function getSelectionParent(r) { if(r.parentElement) return r.parentElement; else if(r.commonAncestorContainer) return r.commonAncestorContainer; else return false; } &lt;/script&gt; </code></pre> <p>HTML:</p> <pre><code>&lt;body&gt; &lt;p&gt;&lt;em&gt;This is just some random text. &lt;/em&gt;&lt;strong&gt;Select me and then click the button!!!&lt;/strong&gt;&lt;/p&gt; &lt;p&gt;&lt;input type="button" value="Parent element?" onclick="alert('The selection\'s parent element is: ' + getSelectionParent(getSelectionRange()).nodeName);" /&gt;&lt;/p&gt; &lt;/body&gt; </code></pre> <p>I tested this stuff in IE6,7 and FF3.0. Worked without any problems. The only thing you must be aware of is that IE unlike FF ignores text nodes. </p> <p>If you want to try it out yourself: <a href="http://dev.freedig.org/files/selection.html" rel="nofollow noreferrer">http://dev.freedig.org/files/selection.html</a></p>
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    1. COI read it, it just gives you the selected text not the node, am I wrong?
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    2. COThe last code example gets the parent node of the text selection. I added it to my answer.
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    3. COthanks but it doesn't work either :( even in the demo link it doesn't give you the object or the element
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