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<!DOCTYPE html> <html> <body> <h3>如何访问 MARK 元素的演示</h3> <p>点击按钮将<mark id="myMark">此标记文本</mark>的字体设置为特大号。</p> <button onclick="myFunction()">试一试</button> <script> function myFunction() { var x = document.getElementById("myMark"); x.style.fontSize = "x-large"; } </script> </body> </html>