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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/more/conformance/quickCheckAPI-C.html b/dom/canvas/test/webgl-conf/checkout/conformance/more/conformance/quickCheckAPI-C.html
new file mode 100644
index 0000000000..3717e41e77
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+++ b/dom/canvas/test/webgl-conf/checkout/conformance/more/conformance/quickCheckAPI-C.html
@@ -0,0 +1,63 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<!--
+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.
+-->
+<link rel="stylesheet" type="text/css" href="../unit.css" />
+<script type="application/javascript" src="../unit.js"></script>
+<script type="application/javascript" src="../util.js"></script>
+<script type="application/javascript" src="quickCheckAPI.js"></script>
+<script type="application/javascript" src="argGenerators-C.js"></script>
+
+<script type="application/javascript">
+
+// Test that all GL functions specified in ArgGenerators work
+// when called with randomly generated valid arguments
+Tests.testValidArgs = function() {
+  var randomTestCount = 100;
+  for (var name in ArgGenerators) {
+    try {
+      if (!GL[name])
+        throw (new Error(name + " is missing from the WebGL context"));
+      var argGen = ArgGenerators[name];
+      var alreadyTriedArgs = {};
+      if (!argGen.generate) continue;
+      // test each GL function with randomTestCount randomly generated valid args
+      argGeneratorTestRunner(argGen, function(args, gen, setupVars) {
+        if (!gen.noAlreadyTriedCheck) {
+          var src = Object.toSource(args);
+          if (alreadyTriedArgs[src])
+            return true;
+
+          alreadyTriedArgs[src] = true;
+        }
+        var ok = false;
+        // if we have an validity checker, assert that the generated args are valid
+        if (gen.checkArgValidity)
+          assert("Valid args: "+name+"("+argsToString(args)+")",
+                gen.checkArgValidity.apply(gen, args));
+        var rv;
+        // assert that GL function works when called with valid args
+        assertOk("This should work: "+name+"("+argsToString(args)+")",
+                function(){rv = GL[name].apply(GL, args); ok = true;});
+        // if we need to cleanup the return value, do it here
+        // e.g. calling gl.deleteBuffer(rv) after testing gl.createBuffer() above
+        if (gen.returnValueCleanup)
+          assertOk("Cleaning up return value after "+name+"("+argsToString(args)+")",
+                   function() { gen.returnValueCleanup(rv); });
+        return ok;
+      }, argGen.testCount || randomTestCount);
+    } catch(e) {
+      testFailed(name, e.name, formatError(e));
+    }
+  }
+}
+
+</script>
+<style>canvas{position:absolute;}</style>
+</head><body>
+</body></html>