A(n) ____________________ is a gradual blend or transition from one color to another.

Include the keyword _____ in a media query to cause older, non-supporting browsers to ignore the media query.

a. viewport b. meta c. skip d. only

The keyword ________ is used in a function header to indicate that a function does not return a value or to indicate that a function contains no parameters.

Fill in the blank(s) with the appropriate word(s).