Use shorthand syntax for classes and longhand syntax for IDs to avoid setting unnecessary defaults and simplify debugging of dynamic class changes through scripting or property changes through pseudo-classes
When using shorthand to set all background properties in one declaration, use the following order for consistency and compatibility across browsers:
Use background-image instead of the background shorthand when using ID selectors to avoid inadvertently overriding class-based background-position changes for CSS sprites
Use list-style shorthand instead of list-style-type for IE6 to avoid the declaration being ignored by the CSS parser
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