ZUSS Reference
From Documentation
This article is out of date, please refer to https://www.zkoss.org/wiki/ZK_Developer%27s_Reference/Theming_and_Styling for more up to date information.
ZUSS (ZK User-interface Style Sheet)[1] is an extension to CSS. It is compatible with CSS and CSS3 including sophisticated selectors, styles and functions, while allows to use variables, mixins, nested rules, expressions, and Java methods with existing CSS syntax.
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