YUI Compressor is removing spaces from filter values

Question

I have a css containing filter for adding Grayout images in FF like this:-

filter: url(\"data:image/svg+xml;utf8,

Answer 1

The URL portion of the string (from to ) needs to be URL-encoded. Or you can put ;base64 after ;utf8 and Base64-encode the URL instead.

But it's incorrect to use spaces in a URL...that's why YUI compressor is messing it up.