Example analysis:
The background attribute is a shorthand attribute that can set all background attributes in one statement.
The attributes that can be set are: background-color, background-position, background-size, background-repeat, background-origin , background-clip, background-attachment, and background-image.
It doesn’t matter if one of the above values is missing, for example, background: #FF0000 URL (smiley.gif); is allowed .