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<!DOCTYPE html> <html> <head> <style> div { height: 100px; width: 500px; background-color: powderblue; } </style> </head> <body> <h2>设置元素的高度和宽度</h2> <p>这个 div 元素的高度为 100px，宽度为 500px：</p> <div></div> </body> </html>