The third shadow effect will be placed to the right and above the text. This property is not defined in CSS1. Some shadow effects may render text invisible in UAs that only support CSS1. This value indicates inter-character space in addition to the default space between characters. Values may be negative, but there may be implementation-specific limits.
Character spacing algorithms are user agent-dependent.
When the resultant space between two characters is not the same as the default space, user agents should not use ligatures. This value indicates inter-word space in addition to the default space between words. Values may be negative, but there may be implementation-specific limits. Word spacing algorithms are user agent-dependent. In this example, the word-spacing between each word in H1 elements is increased by '1em'.