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<html><body><h1 style="color: red; font-size: 50px;">The length Property</h1><p>Click the button to return the number of styles set on the H1 element:</p><button onclick="myFunction()">Try it</button><p id="demo"></p><script>function myFunction() { var elmnt = document.getElementsByTagName("h1")[0]; var x = elmnt.style.length; document.getElementById("demo").innerHTML = x;}</script></body></html>