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Hi Erik,

The data URIs are not supported in IE < 8, but the calendar skin uses an IE-specific *display property on the "<" and ">" symbols in the calendar controls to put them in place if the sprite backgrounds are not supported.

One thing to try would be to overwrite the *background property as well (* will make it specific to IE < 8), with an empty value. I don't know if that will defeat the warning or not off the top of my head.

I'll look into this more and post followups if I find other workarounds.

Ok, it appears that if I add a

*background: none;

after the background with the data URI, I stop getting the warning in IE 7.

Is this something that should be filed as a defect? Could this type of issue be affecting other YUI modules?

This is definitely a defect, and I think the idea to use CSS borders is a good one. Can you file this as a defect for calendar? The short term fix would be adding the *background property, but if I have some extra time left this sprint, I'll switch the skin to CSS borders.