using something along the lines of:
background:url(data:image/gif;base64,R0lGODlhIwAhALMAAAAAADQ0NENDQ25ubouLi6ioqLa2ttPT0/Dw8P///wAAAAAAAAAAAAAAAAAAAAAAACwAAAAAIwAhAAAIpQABCBxIsCCAAAYTKlw4cECCAQwjMnSY4KHEiwQpVrSIUaLGjRw7Kvy4EYEAkSNBljyJ0iDJiiZbulQJk6XMhjQTxLyJk+ZOngBe6rTJU+jPojmTKqXZc6nTpAKFPp0qsMDUqyoHWsWKleBWrk8LfgV5AKjYnGXNakWrdi3NtG3HbjTQtmrOAnUByK2It+7eBH3j5iSQVy5cv3PzegWsuCDExmYDAgA7) no-repeat center center;}
is fine but I want to be able to provide graceful degradation (the css assertion is through javascript) when base64 is not available.
obviously, IE prior to v8 lacks this functionality so I could go by browser - but i'd prefer to have it feature detected, if possible.
any ideas on how do go about doing it?
This might be what you are looking for : http://weston.ruter.net/2009/05/07/detecting-support-for-data-uris/
I worked on a script that adds a partial support of the DataURI scheme in IE6+ : http://phenxdesign.net/projects/phenx-web/iedatauri/example.php and the code is here : http://code.google.com/p/phenx-web/source/browse/trunk/iedatauri/
IE5+ supports a sort of data URI too, it is but not always possible to use it : http://www.betalon.com/blog/html_css/data-uri-in-css-crossbrowser.htm
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