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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/more/conformance/argGenerators-B4.js b/dom/canvas/test/webgl-conf/checkout/conformance/more/conformance/argGenerators-B4.js
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+++ b/dom/canvas/test/webgl-conf/checkout/conformance/more/conformance/argGenerators-B4.js
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+/*
+Copyright (c) 2019 The Khronos Group Inc.
+Use of this source code is governed by an MIT-style license that can be
+found in the LICENSE.txt file.
+*/
+
+// ArgGenerators contains argument generators for WebGL functions.
+// The argument generators are used for running random tests against the WebGL
+// functions.
+//
+// ArgGenerators is an object consisting of functionName : argGen -properties.
+//
+// functionName is a WebGL context function name and the argGen is an argument
+// generator object that encapsulates the requirements to run
+// randomly generated tests on the WebGL function.
+//
+// An argGen object has the following methods:
+//   - setup    -- set up state for testing the GL function, returns values
+//                 that need cleanup in teardown. Run once before entering a
+//                 test loop.
+//   - teardown -- do cleanup on setup's return values after testing is complete
+//   - generate -- generate a valid set of random arguments for the GL function
+//   - returnValueCleanup -- do cleanup on value returned by the tested GL function
+//   - cleanup  -- do cleanup on generated arguments from generate
+//   - checkArgValidity -- check if passed args are valid. Has a call signature
+//                         that matches generate's return value. Returns true
+//                         if args are valid, false if not.
+//
+//   Example test loop that demonstrates how the function args and return
+//   values flow together:
+//
+//   var setupArgs = argGen.setup();
+//   for (var i=0; i<numberOfTests; i++) {
+//     var generatedArgs = argGen.generate.apply(argGen, setupArgs);
+//     var validArgs = argGen.checkArgValidity.apply(argGen, generatedArgs);
+//     var rv = call the GL function with generatedArgs;
+//     argGen.returnValueCleanup(rv);
+//     argGen.cleanup.apply(argGen, generatedArgs);
+//   }
+//   argGen.teardown.apply(argGen, setupArgs);
+//
+ArgGenerators = {
+
+// GL functions in alphabetical order
+
+// B-4
+
+  bufferSubData : {
+    setup : function() {
+      var buf = GL.createBuffer();
+      var ebuf = GL.createBuffer();
+      GL.bindBuffer(GL.ARRAY_BUFFER, buf);
+      GL.bufferData(GL.ARRAY_BUFFER, 256, GL.STATIC_DRAW);
+      GL.bindBuffer(GL.ELEMENT_ARRAY_BUFFER, ebuf);
+      GL.bufferData(GL.ELEMENT_ARRAY_BUFFER, 256, GL.STATIC_DRAW);
+      return [buf, ebuf];
+    },
+    generate : function(buf, ebuf) {
+      var d = randomBufferSubData(256);
+      return [bufferTarget.random(), d.offset, d.data];
+    },
+    checkArgValidity : function(target, offset, data) {
+      return bufferTarget.has(target) && offset >= 0 && data.byteLength >= 0 && offset + data.byteLength <= 256;
+    },
+    teardown : function(buf, ebuf) {
+      GL.deleteBuffer(buf);
+      GL.deleteBuffer(ebuf);
+    },
+  }
+
+};