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<html><style>.example { color: red; width: 150px; font-size: 20px;}</style><body><h1>HTML DOM Attributes</h1><h2>The length() Property</h2><button id="myButton" onclick="myFunction()" class="example">Try it</button><p>How many attributes has the button above?</p><p id="demo"></p><script>let num = document.getElementById("myButton").attributes.length;document.getElementById("demo").innerHTML = num;function myFunction() {}</script></body></html>