IE 6 or earlier versions does not support 24-bit transparency on png images.
One approach Is to use 8-bit PNG or you can also use a gif with a stroke the same color as the background.
There also some hacks and methods that you can find.
Please check here
Finally If the way you tested was working smoothly for you,there is way to bypass the W3C validation problem.
You can target IE with IE conditional comments.
- Code: Select all
This will feed an IE-only style sheet to IE. :-)
: Sorry It's not allowed to post code in this Board