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<!DOCTYPE html> <html> <head> <style> #myHeader { background-color: lightblue; color: black; padding: 40px; text-align: center; } </style> </head> <body> <h2>id 属性</h2> <p>使用 CSS 为 ID 为"myHeader"的元素设置样式：</p> <h1 id="myHeader">我的标题</h1> </body> </html>