1 files changed, 13 insertions, 0 deletions
diff --git a/components/script/dom/webglrenderingcontext.rs b/components/script/dom/webglrenderingcontext.rs
index 874a089a637..ca5c08b25e3 100644
--- a/components/script/dom/webglrenderingcontext.rs
+++ b/components/script/dom/webglrenderingcontext.rs
@@ -276,6 +276,10 @@ impl WebGLRenderingContext {
         }
     }
 
+    pub fn webgl_version(&self) -> WebGLVersion {
+        self.webgl_version
+    }
+
     pub fn limits(&self) -> &GLLimits {
         &self.limits
     }
@@ -4266,6 +4270,15 @@ impl WebGLRenderingContextMethods for WebGLRenderingContext {
             return self.webgl_error(InvalidEnum);
         }
 
+        // From the GLES 2.0.25 spec, page 113:
+        //
+        //     "level specifies the mipmap level of the texture image
+        //      to be attached to the framebuffer and must be
+        //      0. Otherwise, INVALID_VALUE is generated."
+        if level != 0 {
+            return self.webgl_error(InvalidValue);
+        }
+
         match self.bound_draw_framebuffer.get() {
             Some(fb) => handle_potential_webgl_error!(
                 self,