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....hsl() , and hsla() , used commas, but commas are generally only used...separate items in a list. If a comma is used to separate arguments...