Weird :hover bug with z-index and img
Question
I am having a very weird bug trying to highlight some parts of an image with overlays (higher z-index ) on :hover . In Safari / Firefox / Chrome, no issue. But in IE (8 or 9), my simple CSS code doesn't work as it seem that IE doesn't trigger the :hover when the overlays are not always visible (no background-color or visibility:hidden )
Here is a MWE with the HTML and CSS:
<html>
<head>
<style>
.photo-notes {
position: absolute;
z-index: 998;
}
.photo-notes ul {
position: relative;
}
.photo-notes li {
list-style: none;
position: absolute;
background: #ccc;
z-index: 999;
}
.photo-notes li:hover {
background: red;
}
.photo-container {
z-index: 1;
}
</style>
</head>
<body>
<div>
<div class="photo-notes">
<ul>
<li style="left: 25px; top: 20px; width: 50px; height: 100px;"> </li>
</ul>
</div>
<div class="photo-container">
<img src="http://www.google.com/logos/2012/newyearsday-2012-hp.jpg"/>
</div>
</div>
</body>
</html>
The code above works, but if you try to remove the background: #ccc or add visibility:hidden from/to the li styling, it stops working under IE (no more :hover effect).
The additional weird thing is that it does work (the :hover gets triggered) without background or with visibility:hidden on the li if the <img> line is removed. So it's not an issue of :hover not being possible on an element that's not visible in IE as one would think, and I've tried adding explicit z-index es everywhere without success...
Any idea of what's happening and how to solve it?
1 answers
solution1
0 ACCPTED 2012-04-10 19:20:48
Well, I solved it myself by setting a background and opacity:0 on the li (which for IE means filter: alpha(opacity:0)) . This way, the :hover gets triggered properly.
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