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<!DOCTYPE html> <html> <body> <p id="myP">This is a paragraph.</p> <button type="button" onclick="myFunction()">Adjust font size</button> <p><b>Note:</b> The fontSizeAdjust property is only supported in Firefox.</p> <script> function myFunction() { document.getElementById("myP").style.fontSizeAdjust = "0.58"; } </script> </body> </html>