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<!DOCTYPE html> <html> <head> <style> div { width: 400px; height: 400px; border: 1px solid black; } </style> </head> <body> <h1>Hello World!</h1> <div id="myDiv">This is a div element.</div> <br> <button type="button" onclick="myFunction()">Set the background image of div</button> <script> function myFunction() { document.getElementById("myDiv").style.backgroundImage = "url('img_tree.png')"; } </script> </body> </html>