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12 Some browsers, like Internet Explorer 5 for Mac, don??™t support single quotes in url(URI) syntax.
39 General Syntax and Nomenclature
URIs, you can also replace these characters with URI escape sequences; for example,
you can use %20 to replace a space character.
Relative URIs
Relative URIs are relative to the style sheet, not to the HTML document that links
to the style sheet.
Initial Values
The default value for a property, when it??™s not specified explicitly or inherited, is
called the initial value. The initial value of each property is defined in the CSS
specification.
Browsers have user agent style sheets that define the default rendering of the various
HTML element types. In some cases, the rules in those built-in style sheets define
values other than the initial values from the CSS specification. For example, links
are usually underlined, even though the initial value for the text-decoration
property is none.
You can read more about these topics in The Cascade, Specificity, and Inheritance
(p.


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