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    <p>After creating a CSS class, say <code>.fade</code> (with CSS code for transitions etc.), go along this way </p> <pre><code>.hidden { display: none; } </code></pre> <pre><code>&lt;div class="main"&gt;I'll host the hovering div&lt;/div&gt; &lt;div class="hidden fade"&gt;Overlay content&lt;/div&gt; </code></pre> <p>JavaScript Code - </p> <pre><code>var mainDiv = document.querySelector('div.main'); var hoverDiv = document.querySelector('div.hidden'); mainDiv.addEventListener('mouseover', function() { hoverDiv.classList.toggle('hidden'); var h = function() { this.classList.toggle('hidden'); this.removeEventListener('mouseout',h,false); } hoverDiv.addEventListener('mouseout',h,false); },false); </code></pre> <hr> <p>Edit</p> <hr> <p><a href="http://jsfiddle.net/XDgmD/2/" rel="nofollow">http://jsfiddle.net/XDgmD/2/</a></p> <pre><code>body { background-color: silver; } .main { position: absolute; top: 0; left: 0; width: 100px; height: 100px; background-color: blue; box-shadow: 0px 0px 10px yellow; } .hidden { display: none; } .fade { position: absolute; top: 0; left: 0; width: 100px; height: 100px; background-color: black; z-index: 10; color: white; } </code></pre> <hr> <pre><code>var mainDiv = document.querySelector('div.main'); var hoverDiv = document.querySelector('div.hidden'); mainDiv.addEventListener('mouseover', function() { hoverDiv.classList.toggle('hidden'); var h = function() { this.classList.toggle('hidden'); this.removeEventListener('mouseout',h,false); } hoverDiv.addEventListener('mouseout',h,false); },false); </code></pre> <hr> <pre><code>&lt;div class="main"&gt;I'll host the hovering div&lt;/div&gt; &lt;div class="hidden fade"&gt;Overlay content&lt;/div&gt; </code></pre>
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