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....font-family names, or grid areas are listed as a <custom-ident>...For example, the value of grid-area can be a <custom-ident> , so...