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Z-Index Deprecated in xhtml?

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Last Modified: 2013-11-19
Why doesn't the z-index seem to work in the following example?  The text "Layer 2" text doesn't show up on top of the "Layer 1" text unless I remove the DOCTYPE declaration at the top of the page.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang= "en">
<head>
</head>
 
<body>
<div style="position:relative; font-size:50px; z-index:3;">LAYER 1</div>
<div style="position:relative; top:-50; left:5; color:red; font-size:80px; z-index:40">LAYER 2</div>
</body>
 
</html>

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Technical Support
Top Expert 2005
Commented:
This one is on us!
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Commented:
Awesome...thanks for the quick solution!  (And duh...I wish I figured that out on my own!)
Julian MatzTechnical Support
Top Expert 2005

Commented:
No problem. Glad I could help. Sometimes it takes an extra pair of eyes to spot something as simple as this - especially if you've been looking at the same code for a long time :)

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