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<!DOCTYPE html> <html> <body> <textarea id="myTextarea" rows="4" cols="50"> At w3schools.com you will learn how to make a website. We offer free tutorials in all web development technologies. </textarea> <p>Click the button to change the width of the text area.</p> <button type="button" onclick="myFunction()">Try it</button> <script> function myFunction() { document.getElementById("myTextarea").cols = "100"; } </script> </body> </html>