Tryit Editor v2.6

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<!DOCTYPE html>
<html>
<body>

<h1>My First JavaScript</h1>

<p id="demo">JavaScript can change the style of an HTML element.</p>

<script>
function myFunction() {
    document.getElementById("demo").style.fontSize = "25px"; 
}
</script>

<button type="button" onclick="myFunction()">Click Me!</button>

</body>

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</html>