picture要素、picturefillについて

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<picture>
   <source media="(min-width: 600px)" srcset="images/demo-over600.png">
   <img src="images/demo-under600.png" alt="超え" />
</picture>

さしあたってこれでCDNは読み込める。

<script>
   // Picture element HTML5 shiv
   document.createElement( "picture" );
</script>
<script src="https://cdn.rawgit.com/scottjehl/picturefill/3.0.2/dist/picturefill.min.js" async></script>