File: querySelector.html

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<!DOCTYPE html>
<html>
<body>

<h2 class="example">A heading with class="example"</h2>
<p class="example">A paragraph with class="example".</p> 

<p>Click the button to add a background color to the first element in the document with class="example".</p>

<button onclick="myFunction()">Try it</button>

<script>
function myFunction() {
  window.alert(document.querySelector(".example").innerHTML);
}
</script>

</body>
</html>