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<!DOCTYPE html> <html> <body> <h1 id="myH1">How to change the style of a header</h1> <p>Click the button to change the style of the H1 element.</p> <button onclick="myFunction()">Try it</button> <script> function myFunction() { document.getElementById("myH1").style.color = "red"; } </script> </body> </html>
