Tryit Editor v2.9

Edit This Code:
<!DOCTYPE html>
<html>
<body>

<textarea id="myTextarea">
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</textarea>

<p>Click the button to change the width and height of the text area.</p>

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

<script>
function myFunction() {
    document.getElementById("myTextarea").style.height = "100px";
    document.getElementById("myTextarea").style.width = "500px";
}
</script>

</body>
</html>