GWT itself uses a version of Google Closure Stylesheets library internally to support CSS 3 features. GWT updates this library from time to time to support more CSS 3 features and it looks like CSS variables are not yet available in Google Closure Stylesheets: https://github.com/google/closure-stylesheets/pull/121--
For now you have to stick with closure stylesheets variables: https://github.com/google/closure-stylesheets#variables
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