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<html><body><h1>The Document Object</h1><h2>The querySelectorAll() Method</h2><p>Set the background color of all h3 and span elements:</p><h1>A H1 element</h1><h2>A H2 element</h2><h3>A H3 element</h3><p>A p element.</p><p>A p element with a <span style="color:brown;">span</span> element.</p><script>const list = document.querySelectorAll("h3, span");for (let i = 0; i < list.length; i++) { list[i].style.backgroundColor = "red";}</script></body></html>