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<!DOCTYPE html>
<html>
<body>
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<h2>JavaScript HTML DOM</h2>
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<p>Finding HTML Elements by Class Name.</p>
<p class="intro">Hello World!</p>
<p class="intro">This example demonstrates the <b>getElementsByClassName</b> method.</p>
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<p id="demo"></p>
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<script>
const x = document.getElementsByClassName("intro");
document.getElementById("demo").innerHTML = 
'The first paragraph (index 0) with class="intro" is: ' + x[0].innerHTML;
</script>
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</body>
</html>
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