<html><body><h3>如何访问 DFN 元素的演示</h3><dfn id="myDFN">Definition term</dfn><p>单击按钮将定义项的颜色设置为红色。</p><button onclick="myFunction()">试一试</button><script>function myFunction() { var x = document.getElementById("myDFN"); x.style.color = "red";}</script></body></html>