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<html><body><h1>The HTMLCollection Object</h1><h2>The length Property</h2><p>Click "Change" to change all elements with class="myclass":</p><button onclick="myFunction()">Change</button><p>I am a paragraph.</p><p class="myclass">I am a paragraph.</p><p class="myclass">I am a paragraph.</p><script>function myFunction() { const collection = document.getElementsByClassName("myclass"); for (let i = 0; i < collection.length; i++) { collection[i].style.fontSize = "24px"; }}</script></body></html>