hanging and eachline should be :: Size a -> TextIndent

[dbaynard]

From https://developer.mozilla.org/en-US/docs/Web/CSS/text-indent

Formal syntax

<length-percentage> && hanging? && each-line?
where 
<length-percentage> = <length> | <percentage>

Examples

/* Keyword values */
text-indent: 5em each-line;
text-indent: 5em hanging;
text-indent: 5em hanging each-line;

Browser support is lacking, unfortunately (presumably how the error crept in) but Prince supports the keywords.