In HTML and URL specs, the URL should not contain any space: https://url.spec.whatwg.org/#url-scheme-string
However this does not seem to be true in CSS: the specs warn that spaces are not accepted in the URLs when not using quotation marks (which would mean that they are allowed as long as we're using quotation marks).
But in the end https://www.ietf.org/rfc/rfc1738.txt marks the space as `unsafe` in an URL, which means that they should always be encoded...
The specs seem to be a bit confused here (CSS being looser than others) and this must be why it's a bug with YUI...
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