A crude polyfill for proposed behavior of the picture element, which does not yet exist, but should. :)
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Author: Scott Jehl (c) 2012
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License: MIT/GPLv2
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Notes: For active discussion of the picture element, see http://www.w3.org/community/respimg/. While this code does work, it is intended to be used only for example purposes until either:
A) A W3C Candidate Recommendation for
is released B) A major browser implements
Demo URL: http://scottjehl.github.com/picturefill/
Note: The demo only polyfills picture support for browsers that support CSS3 media queries, but it includes the matchMedia polyfill for media-query-supporting browsers that don't have matchMedia.