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我有这个代码：
<a href="/smi" class="media-link"> <img src="/images2/smi.png" alt="About"> </a>
smi.png - 这是简单的图像
我有smi2.png - 这是视网膜图像
如何在此代码中设置两个图像？
<a href="/smi" class="media-link"> <img src="/images2/smi.png" srcset="/images2/smi2.png 2x"> </a>
http://www.w3.org/html/wg/drafts/srcset/w3c-srcset/