Partial URLs are interpreted relative to the source of the style sheet

6.4 URL

A Uniform Resource Locator (URL) is identified with a functional notation:

BODY { background: url(http://www.bg.com/pinkish.gif) }
The format of a URL value is ‘url(‘ followed by optional white space followed by an optional single quote (‘) or double quote (“) character followed by the URL itself (as defined in [11]) followed by an optional single quote (‘) or double quote (“) character followed by optional whitespace followed by ‘)’. Quote characters that are not part of the URL itself must be balanced.

Parentheses, commas, whitespace characters, single quotes (‘) and double quotes (“) appearing in a URL must be escaped with a backslash: ‘\(‘, ‘\)’, ‘\,’.

Partial URLs are interpreted relative to the source of the style sheet, not relative to the document:

BODY { background: url(yellow) }

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