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<!DOCTYPE html> <html> <head> <style> div { width: 320px; padding: 10px; border: 5px solid gray; margin: 0; } </style> </head> <body> <h2>计算总宽度：</h2> <img src="klematis4_big.jpg" width="350" height="263" alt="Klematis"> <div>上图是 350px 宽。 这个元素的总宽度也是 350px。</div> </body> </html>