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diff --git a/dom/interfaces/canvas/nsIDOMWebGLRenderingContext.idl b/dom/interfaces/canvas/nsIDOMWebGLRenderingContext.idl
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+++ b/dom/interfaces/canvas/nsIDOMWebGLRenderingContext.idl
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+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+[builtinclass, uuid(f1a2fd3a-c6ac-4ee2-a700-5d285d5e3fff)]
+interface nsIDOMWebGLRenderingContext : nsISupports
+{
+ // get an underlying GL parameter, without any WebGL intervention.
+ // Most useful for querying GL_VENDOR/GL_RENDERER for identifying
+ // the underlying renderer to the user.
+ [noscript] DOMString mozGetUnderlyingParamString(in unsigned long pname);
+};