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<!DOCTYPE html> <html> <head> <style> #myDIV { border: 1px solid black; } </style> </head> <body> <div id="myDIV"> <h3>A h3 element in div</h3> <h2>A h2 element in div</h2> </div> <script> var x = document.getElementById("myDIV"); x.querySelector("h2, h3").style.backgroundColor = "red"; </script> </body> </html>