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<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>