Chapter 16 Vendor-specific Properties
Vendor-specific Properties
Vendors??”browser makers??”are free to implement extensions to the CSS
specifications that, in most cases, are proprietary to their browser. They may do
this for a number of reasons, such as adding new features for users, or for experiments
and debugging. Most often, though, the extensions are used to release and test
browser features that have been developed in the preparation of W3C drafts that
have not yet reached Candidate Recommendation status??”the extensions allow these
new properties to be widely tested before they become available as standard CSS
properties.
In order to accommodate the release of vendor-specific extensions, the CSS
specifications1 define a specific format that vendors should follow.
The format is quite simple: keywords and property names beginning with - (dash)
or _ (underscore) are reserved for vendor-specific extensions. As such, vendors
should use the following formats:
1 http://www.w3.
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