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<!DOCTYPE html> <html> <body> <h3>A demonstration of how to access a MARK element</h3> <p>Click the button to set the font size of <mark id="myMark">this marked text</mark> to extra large.</p> <button onclick="myFunction()">Try it</button> <script> function myFunction() { var x = document.getElementById("myMark"); x.style.fontSize = "x-large"; } </script> </body> </html>