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    <p>When <code>visibility: hidden</code> is set, no mouse events are sent to the element. </p> <p>What you were seeing is the <code>mouseout</code> event firing as the element went hidden which then caused the code to set it visible again which then triggered the <code>mouseover</code> event as soon as the mouse moved - and so on. </p> <p>Some additional information here: <a href="https://stackoverflow.com/questions/272360/does-opacity0-have-exactly-the-same-effect-as-visibilityhidden">Does opacity:0 have exactly the same effect as visibility:hidden</a></p> <p>Use <code>opacity: 0</code> instead.</p> <p><a href="http://jsfiddle.net/davidcl64/uFLPg/2/" rel="nofollow noreferrer">Fiddle</a></p> <pre><code>window.onload = function(){ var tag = document.getElementById('tag'); tag.style.opacity = 0; tag.onmouseover = function () { tag.style.opacity = 1; } tag.onmouseout = function () { tag.style.opacity = 0; } } </code></pre> <hr> <p>If you are concerned about older browser support for opacity, you can still use <code>visibility: hidden;</code> by wrapping the <code>tag</code> div in a <code>div</code> with its background set to <code>transparent</code>. </p> <p>Attach the mouseover/mouseout handlers to the wrapping div and change the visibility of the child. This avoids the repeated mouseover/mouseout events as the wrapper will always receive mouse events.</p> <p><a href="http://jsfiddle.net/davidcl64/uFLPg/4/" rel="nofollow noreferrer">Demo 2:</a></p> <p>HTML:</p> <pre><code>&lt;div style='position:relative'&gt; &lt;div id='tag' style='position : absolute; top: 20px; left: 20px; width: 50px; height: 50px; z-index: 10; background: transparent;'&gt; &lt;div id='tagInner' style=' border: 1px solid red; position : absolute; top: 0; left: 0; right: 0; bottom: 0;'&gt; &lt;/div&gt; &lt;/div&gt; &lt;img src='http://www.hihowareyou.com/store/images/products/tn_HiVinylFrontmed.jpg' id='wow'&gt; &lt;/div&gt; </code></pre> <p>Code:</p> <pre><code>var tag = document.getElementById('tag'); var tagInner = document.getElementById('tagInner'); tagInner.style.visibility = 'hidden'; tag.onmouseover = function () { tagInner.style.visibility = 'visible'; } tag.onmouseout = function () { tagInner.style.visibility = 'hidden'; } </code></pre> <hr> <p>There is also an interesting writeup on CSSTricks about <a href="http://css-tricks.com/css-transparency-settings-for-all-broswers/" rel="nofollow noreferrer">CSS Transparency Settings for All Browsers</a>. I haven't tried that approach myself with older browsers, but it may work for you.</p>
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    1. POWhy it will produce blinking effect when css turn from visibility visble to hidden
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    1. COcan you provide reference or documentation so I can know more about it :)??
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    2. CO@dramasea I can't seem to dig it out of the spec but did find several references on stack overflow. Added a link to one in the answer.
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    3. COdo opacity work in all browser?
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