diff -r 000000000000 -r 9321b4016d5c javaquery/api/src/main/java/org/apidesign/bck2brwsr/htmlpage/PredefinedFields.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/javaquery/api/src/main/java/org/apidesign/bck2brwsr/htmlpage/PredefinedFields.java	Thu May 02 10:08:35 2013 +0200
@@ -0,0 +1,65 @@
+/**
+ * Back 2 Browser Bytecode Translator
+ * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. Look for COPYING file in the top folder.
+ * If not, see http://opensource.org/licenses/GPL-2.0.
+ */
+package org.apidesign.bck2brwsr.htmlpage;
+
+import java.io.IOException;
+import java.io.Writer;
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ *
+ * @author Jan Horvath <jhorvath@netbeans.org>
+ */
+public class PredefinedFields {
+    
+    private static final Map<String, String> IMPORTS = new HashMap<String, String>() {
+        {
+            put("canvas", "import org.apidesign.bck2brwsr.core.JavaScriptBody;");
+        }
+    };
+    
+    private static final Map<String, String> FIELDS = new HashMap<String, String>() {
+        {
+            put("canvas", 
+                    "    @JavaScriptBody(\n" +
+                    "            args = {\"el\"},\n" +
+                    "            body = \"var e = window.document.getElementById(el._id());\\n\"\n" +
+                    "            + \"return e.getContext('2d');\\n\")\n" +
+                    "    private native static Object getContextImpl(Canvas el);\n" +
+                    "    \n" +
+                    "    public GraphicsContext getContext() {\n" +
+                    "        return new GraphicsContext(getContextImpl(this));\n" +
+                    "    }");
+        }
+    };
+    
+    static void appendImports(Writer w, String tag) throws IOException {
+        String text = IMPORTS.get(tag.toLowerCase());
+        if (text != null) {
+            w.append(text).append("\n");
+        }
+    }
+    
+    static void appendFields(Writer w, String tag) throws IOException {
+        String text = FIELDS.get(tag.toLowerCase());
+        if (text != null) {
+            w.append(text).append("\n");
+        }
+    }
+}