<img srcset="elva-fairy-320w.jpg 320w,
elva-fairy-480w.jpg 480w,
elva-fairy-800w.jpg 800w"
sizes="(max-width: 320px) 280px,
(max-width: 480px) 440px,
800px"
src="elva-fairy-800w.jpg" alt="Elva dressed as a
fairy">
如果屏幕为480px，并且浏览器选择440px作为插槽大小，那么将选择elva-fairy-480w，那么浏览器显示的图像宽度是440px还是480px？