Every CSS declaration includes a property / value pair. Depending on the property, the value can include a single integer or keyword, to a series of keywords and values with or without units. There are a common set of data types — values and units — that CSS properties accept. Below is an overview of most of these data types. Refer to the page for each value type for more detailed information....as an <ident> <string> <url> Text data types are either <string>...quoted and unquoted user defined text values are permitted, the specification...