diff --git a/components/script/dom/webglrenderingcontext.rs b/components/script/dom/webglrenderingcontext.rs
index c5070cca69ee..b62095b9f072 100644
--- a/components/script/dom/webglrenderingcontext.rs
+++ b/components/script/dom/webglrenderingcontext.rs
@@ -181,6 +181,13 @@ impl WebGLRenderingContextMethods for WebGLRenderingContext {
         Root::from_ref(&*self.canvas)
     }
 
+    // https://www.khronos.org/registry/webgl/specs/latest/1.0/#5.14.11
+    fn Flush(&self) {
+        self.ipc_renderer
+            .send(CanvasMsg::WebGL(CanvasWebGLMsg::Flush()))
+            .unwrap();
+    }
+
     // https://www.khronos.org/registry/webgl/specs/latest/1.0/#5.14.1
     fn DrawingBufferWidth(&self) -> i32 {
         let (sender, receiver) = ipc::channel().unwrap();
diff --git a/components/script/dom/webidls/WebGLRenderingContext.webidl b/components/script/dom/webidls/WebGLRenderingContext.webidl
index ea49e38d4bd5..c022a5e2f249 100644
--- a/components/script/dom/webidls/WebGLRenderingContext.webidl
+++ b/components/script/dom/webidls/WebGLRenderingContext.webidl
@@ -557,7 +557,7 @@ interface WebGLRenderingContextBase
     void enable(GLenum cap);
     void enableVertexAttribArray(GLuint index);
     //void finish();
-    //void flush();
+    void flush();
     //void framebufferRenderbuffer(GLenum target, GLenum attachment,
     //                             GLenum renderbuffertarget,
     //                             WebGLRenderbuffer? renderbuffer);
@@ -717,4 +717,3 @@ interface WebGLRenderingContext
 {
 };
 WebGLRenderingContext implements WebGLRenderingContextBase;
-