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    <p>CSS only allow elements to react on parent's hover (maybe siblings too, I'm not sure, if someone can tell).</p> <p>You'll have to use Javascript for this.</p> <p>For convenience, here's an example using jQuery :</p> <h2>HTML</h2> <pre><code>&lt;span data-tooltip-id="ref0"&gt;Reference 0&lt;/span&gt; ... &lt;div id="ref0"&gt;This is the reference 0&lt;/div&gt; </code></pre> <h2>Javascript</h2> <pre><code>$('.elements-to-hover').hover(function(){ var idRef = $(this).data('tooltip-id'); $('#'+idRef).addClass('yourBorderedClass'); },function(){ var idRef = $(this).data('tooltip-id'); $('#'+idRef).removeClass('yourBorderedClass'); }); </code></pre> <p>The first function is triggered on <code>mouseenter</code>, the second function on <code>mouseleave</code>.</p> <p>See <a href="https://www.google.fr/url?sa=t&amp;rct=j&amp;q=&amp;esrc=s&amp;source=web&amp;cd=1&amp;cad=rja&amp;ved=0CDAQFjAA&amp;url=http://api.jquery.com/hover/&amp;ei=feloUoOeA-PC0QXsuIGwAg&amp;usg=AFQjCNEIyQPzHZVNpBFlBiyQdRbg0gdCwg&amp;sig2=P8RaKlCZtH2KNwH-79kmAA&amp;bvm=bv.55123115,d.d2k" rel="nofollow">jQuery's <code>.hover()</code></a> for reference.</p> <h2>Edit</h2> <p>On your case, you'll bind this function to all your reference anchors :</p> <pre><code>$('#faq1link, #faq2link, #faq3link').hover(function(event){ var idRef = $(this).attr('href'); // or this.href $('#'+idRef).addClass('yourBorderedClass'); },function(){ var idRef = $(this).attr('href'); // or this.href $('#'+idRef).removeClass('yourBorderedClass'); }); </code></pre> <p><strong>I strongly suggest you</strong> to add either a common <code>class</code> to your <code>&lt;a&gt;</code>, or add a identifiable wrapper for these elements. It will allow you to bind <code>hover()</code> without specifying each <code>&lt;a&gt;</code> tag, using something like <code>$('.refAnchors')</code> or <code>$('.refAnchorsWrapper a')</code>.</p>
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    1. POHow can I achieve the mouseover effect like on wikipedia?
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    1. USBigood
    1. USBigood
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    1. POHow can I achieve the mouseover effect like on wikipedia?
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      1. VTUpMod
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    1. COThanks Bigood, But like wikipedia, there are lots of reference, does that mean I have to write the code you provided for each reference item? Are there any smarter way to do that?
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      1. USDennisboys
    2. COHTML5. Use `data-` tags and javascript. Jquery would be quick and dirty
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      1. USbobthyasian
    3. CO@Dennisboys See my edited answer
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