diff --git a/lib/jsduck/doc/ast.rb b/lib/jsduck/doc/ast.rb
index <HASH>..<HASH> 100644
--- a/lib/jsduck/doc/ast.rb
+++ b/lib/jsduck/doc/ast.rb
@@ -95,7 +95,6 @@ module JsDuck
       def create_css_mixin(docs, doc_map)
         return add_shared({
             :tagname => :css_mixin,
-            :name => detect_name(:css_mixin, doc_map),
             :doc => detect_doc(:css_mixin, doc_map),
           }, doc_map)
       end
Remove CSS mixin name detection from DocAst.

There is no @tag for CSS Mixins, and therefore no way to define
a mixin name inside documentation - it can only be derived from code.