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2.2.8 [CSS-Level2-2009] Section 4.3.4, URLs and URIs

V0188:

The specification states:

The format of a URI value is 'url(' followed by optional white space followed by an 
optional single quote (') or double quote (") character followed by the URI itself, 
followed by an optional single quote (') or double quote (") character followed by 
optional white space followed by ')'. The two quote characters must be the same.

Quirks Mode and IE7 Mode (All Versions)

Spaces are incorrectly allowed between a function name (such as URL) and the opening parenthesis.

V0189:

The specification states:

Some characters appearing in an unquoted URI, such as parentheses, white 
space characters, single quotes (') and double quotes ("), must be escaped with a 
backslash so that the resulting URI value is a URI token: '\(', '\)'.

Quirks Mode and IE7 Mode (All Versions)

The ability to escape characters with a backslash in a URI is not supported.

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