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<!DOCTYPE html> <html> <body> <h1>This is a Heading</h1> <img id="img1" src="bulbon.gif" style="position:absolute;left:0px;top:0px;z-index:-1;width:100px;height:180px;"> <button type="button" onclick="myFunction()">Alert stack order</button> <p>Default z-index is 0. Z-index -1 has lower priority.</p> <script> function myFunction() { alert(document.getElementById("img1").style.zIndex); } </script> </body> </html>