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<html><body><h1>The Element Object</h1><h2>The children Property</h2><p>Click "Change" to change the background of all child elements of body.</p><button onclick="myFunction()">Change</button><h2>I am a h2 element</h2><div>I am a div element</div><span>I am a span element</span><script>function myFunction() {const collection = document.body.children;for (let i = 0; i < collection.length; i++) { collection[i].style.backgroundColor = "red"; }}</script></body></html>