<html><head><style>div { width: 320px; padding: 10px; border: 5px solid gray; margin: 0;}</style></head><body><h1>计算总宽度：</h1><img src="klematis4_big.jpg" width="350" height="263" alt="Klematis"><div>上面的图片宽 350 像素。此因素的总宽也是 350 像素。</div></body></html>