0 0 0 0.5em;

0 0 1em;

1em 0.5em;

1em 0.5em 1em;

0 2em 1em -0.7em;

0.3em 0.3em lightgreen;

0.3em 0.3em 0 0.6em lightgreen;

0 2em 0 -0.9em lightgreen;

2em 1.5em 0 -0.7em lightgreen;

9em 1.2em 0 -0.6em lightgreen;

-27.3em 0 lightgreen;

0 2em 0 -1em lightgreen;

0 0 1em maroon;

0 0 1em 0.5em maroon;

0 0 1em 1em maroon;

-0.4em -0.4em 1em olive;

0.4em 0.4em 1em olive;

0.4em 0.4em 1em -0.2em olive;

0.4em 0.4em 1em 0.4em olive;

0 1.5em 0.5em -1em olive;

inset 0.2em 0.4em red, inset -1em -0.7em red;

inset 11em 0 red;

inset -1em 0 red;

inset 13em 0 3em -3em orange,inset -3em 0 3em -3em blue;

inset 11em 0 2em orange;

inset 0 0.3em red;

inset 0 -1.1em red;

inset 1em 0 1em -1em blue;

inset 0 0 0.5em blue;

inset 0 0 2em blue;

inset 0 2em 3em -1em green;

inset 0 2em 3em -2em green;

inset 0 2em 3em -3em green;

inset 0 0 1em khaki;

inset 0 0 1em khaki, inset 0 0 1em khaki, inset 0 0 1em khaki, inset 0 0 1em khaki;

inset 0 0 0.5em 0.5em khaki;

/* seamless if <blur-radius> ≤ <spread-radius> */

inset 0 0 0.5em 0.5em khaki;

inset 0 0 2em 2em khaki;

0 0 0.5em 0.5em teal;

inset 0 0 0.5em 0.5em indigo, 0 0 0.5em 0.5em indigo;

inset 0 0 1em black, inset 0 0 1em black, inset 0 0 1em black, inset 0 0 1em black;

inset 0 0 0.7em 0.5em black; /* should be very similar to above */

inset 0 2em 3em -1.5em green, inset 0 -2em 3em -2em blue;

inset 1em 1em 2em -1em blue;

inset 1em 1em 2em -1em blue, inset -1em -1em 2em -1em red;

inset 0 2em 3em -2em white, inset 0 -2em 3em -2.5em black;

inset 1em 1em 1em -1em white, inset -1em -1em 1em -1em black;

inset -1em -1em 1em -1em black, inset 1em 1em 1em -1em white;

inset -0.3em -0.3em 0.6em rgba(0,0,0,0.5), inset 0.3em 0.3em 0.6em rgba(256,256,256,0.7);

inset 0.3em 0.3em 0.6em rgba(256,256,256,0.5), inset -0.3em -0.3em 0.6em rgba(0,0,0,0.5);

0.2em 0.2em 0.7em black, inset 0 0 0.7em red;