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Comment by Kilimanjaro | Hacker News Reader

FTFY

    <imgset>
      <img src="foo.jpg">
      <img src="foo1.jpg" width="100">
      <img src="foo2.jpg" density="2">
    </imgset>

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Not a good idea. Browsers that do not support imgset would show all three images using that syntax. A new element name like "<set>" would be ignored by them.

CSS to the rescue

    imgset img{display:none;}
    imgset img:first-child{display:block;}

Same with modern HTML5 tags, modernizer or any other tool would handle that for you.

Not really, what about browsers that don't support first-child? Backwards compatibility is important.

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