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<!DOCTYPE html> <html> <body> <p id="demo">这是一个段落。</p> <button type="button" onclick="myFunction()">调整字体大小</button> <p><b>注意：</b> fontSizeAdjust 属性仅在 Firefox 中受支持。</p> <script> function myFunction() { document.getElementById("demo").style.fontSizeAdjust = "0.58"; } </script> </body> </html>