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