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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/glsl/functions/glsl-function-atan.html b/dom/canvas/test/webgl-conf/checkout/conformance/glsl/functions/glsl-function-atan.html
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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.
+-->
+
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>GLSL atan function test</title>
+<link rel="stylesheet" href="../../../resources/js-test-style.css"/>
+<link rel="stylesheet" href="../../../resources/glsl-feature-tests.css"/>
+<script src="../../../js/js-test-pre.js"></script>
+<script src="../../../js/webgl-test-utils.js"> </script>
+<script src="../../../js/glsl-generator.js"> </script>
+</head>
+<body>
+<div id="description"></div>
+<div id="console"></div>
+<script>
+"use strict";
+
+var piConstants = [
+  "const float kPI     = 3.14159265358979323846;",
+  "const float kHalfPI = (kPI * 0.5);",
+  "const float k2PI    = (kPI * 2.0);"
+].join("\n");
+
+var kPI = Math.PI;
+var kHalfPI = Math.PI * 0.5;
+var k2PI = Math.PI * 2.0;
+var atan = Math.atan;  // shorthand
+
+GLSLGenerator.runReferenceImageTest({
+  feature: "atan",
+  args: "$(type) value",
+  testFunc: "$(func)($(type))",
+  gridRes: 8,
+  tolerance: 4,
+  extra: piConstants,
+  tests: [
+    {
+      source: ["$(output) = vec4(",
+               "    $(func)($(input).x * 8.0 - 4.0) / k2PI + 0.5,",
+               "    0.5,",
+               "    0,",
+               "    1);"].join("\n"),
+      generator: function(x, y, z, w) {
+        return [ atan(x * 8.0 - 4.0) / k2PI + 0.5,
+                 0.5,
+                 0,
+                 1 ];
+      },
+    },
+    {
+      source: ["$(output) = vec4(",
+               "    $(func)($(input).xy * 8.0 - vec2(4, 4)) / k2PI + vec2(0.5, 0.5),",
+               "    0, 1);"].join("\n"),
+      generator: function(x, y, z, w) {
+        return [ atan(x * 8.0 - 4) / k2PI + 0.5,
+                 atan(y * 8.0 - 4) / k2PI + 0.5,
+                 0,
+                 1 ];
+      },
+    },
+    {
+      source: ["$(output) = vec4(",
+               "    $(func)($(input).xyz * 8.0 - vec3(4, 4, 4)) / k2PI + vec3(0.5, 0.5, 0.5),",
+               "    1);"].join("\n"),
+      generator: function(x, y, z, w) {
+        return [ atan(x * 8.0 - 4) / k2PI + 0.5,
+                 atan(y * 8.0 - 4) / k2PI + 0.5,
+                 atan(z * 8.0 - 4) / k2PI + 0.5,
+                 1 ];
+      },
+    },
+    {
+      source: ["$(output) = ",
+               "    $(func)($(input) * 8.0 - vec4(4, 4, 4, 4)) / k2PI + vec4(0.5, 0.5, 0.5, 0.5);",
+              ].join("\n"),
+      generator: function(x, y, z, w) {
+        return [ atan(x * 8.0 - 4) / k2PI + 0.5,
+                 atan(y * 8.0 - 4) / k2PI + 0.5,
+                 atan(z * 8.0 - 4) / k2PI + 0.5,
+                 atan(w * 8.0 - 4) / k2PI + 0.5 ];
+      },
+    },
+  ]
+});
+var successfullyParsed = true;
+</script>
+</body>
+</html>
+