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<html>
<body>
<div id="myDiv"
style="position:absolute;
left:100px;
top:50px;
width:100px;
height:50px;
z-index:1;
background-color:red;">
This div is absolute positioned with an z-index of 1.
</div>
<div style="position:absolute;
left:100px;
top:50px;
z-index:12;
height:50;
background-color:blue;">
This is a div element with a z-index of 12.
</div>
<button onclick="myDiv.style.zIndex = 20;">
Bring red to front
</button>
</body>
</html>
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