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Find Highest Z-Index by Tag Name

/ Published in: JavaScript
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Copy this code and paste it in your HTML 
  1. function findHighestZIndex(elem) {
  2. 	var elems = document.getElementsByTagName(elem);
  3. 	var highest = 0;
  4.  
  5. 	for (var i = 0; i < elems.length; i++) {
  6. 		var zindex=document.defaultView.getComputedStyle(elems[i],null).getPropertyValue("z-index");
  7. 		if ((zindex > highest) && (zindex != 'auto')) {
  8. 			highest = zindex;
  9. 		}
  10. 	}
  11.  
  12. 	return highest;
  13. }

URL: http://stackoverflow.com/questions/1118198/how-can-you-figure-out-the-highest-z-index-in-your-document

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