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diff --git a/bundles/org.simantics.document.ui/src/org/simantics/document/ui/CSSTextEditorEnvironment.java b/bundles/org.simantics.document.ui/src/org/simantics/document/ui/CSSTextEditorEnvironment.java
new file mode 100644
index 000000000..7adfee057
--- /dev/null
+++ b/bundles/org.simantics.document.ui/src/org/simantics/document/ui/CSSTextEditorEnvironment.java
@@ -0,0 +1,48 @@
+package org.simantics.document.ui;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.List;
+
+import org.eclipse.jface.text.IDocument;
+import org.eclipse.jface.text.contentassist.ICompletionProposal;
+
+/**
+ * TODO: content assist features to be implemented
+ * 
+ * For a "template" implementation, see SCLTextEditorEnvironment.
+ * 
+ * @author Antti Villberg
+ */
+public class CSSTextEditorEnvironment {
+
+    private CSSCompletionProposal[] proposalCache = new CSSCompletionProposal[0];
+    private List<CSSCompletionProposal> moduleProposalCache = new ArrayList<>(0);
+
+    public void updateEnvironment(IDocument document) {
+        // TODO: implement if necessary
+    }
+
+    public ICompletionProposal[] getCompletionProposals(String tmpPrefix, int offset) {
+        // TODO: find proposals
+        List<CSSCompletionProposal> proposals = new ArrayList<>();
+        moduleProposalCache = proposals;
+        Collections.sort(proposals, COMPARATOR);
+        moduleProposalCache.addAll(proposals);
+        proposalCache = moduleProposalCache.toArray(new CSSCompletionProposal[moduleProposalCache.size()]);
+        return proposalCache;
+    }
+
+    private static final Comparator<CSSCompletionProposal> COMPARATOR = (prop1, prop2) -> {
+        if (prop1.isPrivate() && !prop2.isPrivate())
+            return -1;
+        else if (!prop1.isPrivate() && prop2.isPrivate())
+            return 1;
+        return prop1.getName().compareTo(prop2.getName());
+    };
+
+    public String getHoverInfo(String text) {
+        return null;
+    }
+}