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<!DOCTYPE html> <html> <head> <style> img.one { height: auto; } img.two { height: 200px; width: 200px; } div.three { height: 300px; width: 300px; background-color: powderblue; } </style> </head> <body> <h2>设置元素的高度和宽度</h2> <p>原始图像：</p> <img class="one" src="ocean.jpg" width="300" height="300"><br> <p>图片大小（200x200 像素）：</p> <img class="two" src="ocean.jpg" width="300" height="300"><br> <p>这个 div 元素的高度和宽度是 300px：</p> <div class="three"></div> </body> </html>