diff -r 5e13b1ac2886 -r e8283f10a127 javaquery/api/src/main/java/org/apidesign/bck2brwsr/htmlpage/api/GraphicsContext.java
--- a/javaquery/api/src/main/java/org/apidesign/bck2brwsr/htmlpage/api/GraphicsContext.java	Sat Jan 26 08:47:05 2013 +0100
+++ b/javaquery/api/src/main/java/org/apidesign/bck2brwsr/htmlpage/api/GraphicsContext.java	Thu Feb 14 12:06:16 2013 +0100
@@ -307,10 +307,10 @@
     public native double getGlobalAlpha();
 
     @JavaScriptBody(args = {"operation"}, body = "this._context().globalCompositeOperation=operation;")
-    public native void setGlobalCompositeOperation(double alpha);
+    public native void setGlobalCompositeOperation(String operation);
 
     @JavaScriptBody(args = {}, body = "return this._context().globalCompositeOperation;")
-    public native double getGlobalCompositeOperation();
+    public native String getGlobalCompositeOperation();
 
     public LinearGradient createLinearGradient(double x0, double y0, double x1, double y1) {
         return new LinearGradient(createLinearGradientImpl(context, x0, y0, x1, y1));