`box-shadow -moz-box-shadow -webkit-box-shadow`

CSS 3 box-shadow property, inset keyword and spread radius test case
See also developer.mozilla.org/en/CSS/-moz-box-shadow

inset? && [ <offset-x> <offset-y> <blur-radius>? <spread-radius>? && <color>? ]

0.5em -0.5em 0.4em red, 0.5em 0.5em 0.4em gold, -0.5em 0.5em 0.4em lime, -0.5em -0.5em 0.4em blue;

0 0 0 0.5em;

0 0 1em;

1em 0.5em;

1em 0.5em 1em;

0.3em 0.3em silver;

0.3em 0.3em 0 0.6em silver;

0 0 1em maroon;

0 0 1em 0.5em 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;

inset 0 0 0.5em blue;

inset 0 0 1em 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 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; /* background:red */

inset 1em 1em 1em -1em white, inset -1em -1em 1em -1em black; /* background:red */

inset -1em -1em 1em -1em black, inset 1em 1em 1em -1em white; /* background:red */

inset -3em 0 3em -2em blue;

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