In CSS, canonical order is used to refer to the order in which separate values need to be specified (or parsed) or are to be serialized as part of a CSS property value. It is defined by the formal syntax of the property and normally refers to the order in which longhand values should be specified as part of a single shorthand value.
For example, background
shorthand property values are made up of several background-*
longhand properties. The canonical order of those longhand values is defined as
background-image
background-position
background-size
background-repeat
background-attachment
background-origin
background-clip
background-color
Furthermore, its syntax defines, that if a value for the background-size
is given, it must be specified after the value for the background-position
, separated by a slash. Other values may appear in any order.
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