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diff --git a/dom/canvas/test/webgl-conf/checkout/extra/webgl-translate-shader.html b/dom/canvas/test/webgl-conf/checkout/extra/webgl-translate-shader.html
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@@ -0,0 +1,153 @@
+<!--
+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>WebGL Shader Translator</title>
+<style>
+textarea {
+    min-width: 70%;
+    min-height: 200px;
+    font-family: monospace;
+    background: #def;
+}
+#disabled {
+    color: red;
+    font-weight: bold;
+}
+</style>
+<script>
+// Needed by wtu.create3DContext():
+var testFailed = function() {};
+</script>
+<script src="../js/webgl-test-utils.js"> </script>
+<script>
+"use strict";
+window.onload = main;
+
+var gl;
+var debugShaders;
+var enabledExtensions = [];
+
+var translateButton;
+var extButton;
+
+function main() {
+  translateButton = document.getElementById('translate');
+  extButton = document.getElementById('getExts');
+
+  var wtu = WebGLTestUtils;
+  // Prioritize creating a WebGL 2 context if possible - if not, fall back to WebGL 1.
+  gl = wtu.create3DContext(undefined, undefined, 2);
+  if (!gl || !gl.getExtension('WEBGL_debug_shaders'))
+  {
+    gl = wtu.create3DContext();
+  }
+  if (!gl) {
+    disable();
+    return;
+  }
+
+  debugShaders = gl.getExtension('WEBGL_debug_shaders');
+  if (!debugShaders) {
+    disable();
+  }
+}
+
+function disable() {
+  translateButton.disabled = true;
+  extButton.disabled = true;
+  document.getElementById('disabled').style.display = 'block';
+}
+
+function getExtensions() {
+    getExtensionSet([
+        'EXT_frag_depth',
+        'EXT_shader_texture_lod',
+        'OES_standard_derivatives',
+        'WEBGL_draw_buffers'
+    ]);
+}
+
+function getExtensionSet(shaderExtensions) {
+    for (var i = 0; i < shaderExtensions.length; ++i) {
+        if (enabledExtensions.indexOf(shaderExtensions[i]) < 0) {
+            var ext = gl.getExtension(shaderExtensions[i]);
+            if (ext) {
+                enabledExtensions.push(shaderExtensions[i]);
+            }
+        }
+    }
+    if (enabledExtensions.length > 0) {
+        document.getElementById('enabled-extensions').textContent = enabledExtensions.join(', ');
+    }
+}
+
+function translateShader() {
+    var sourceElement = document.getElementById('original-shader');
+    var source = sourceElement.value;
+
+    var output = document.getElementById('translated-shader');
+    var infoLog = document.getElementById('info-log');
+    var shaderType = document.getElementById('shader-type');
+    infoLog.value = '';
+
+    // Try compiling the source as both vertex and fragment shader and see if either one works
+    var tryCompile = function(type) {
+        var shader = gl.createShader(type);
+        gl.shaderSource(shader, source);
+        gl.compileShader(shader);
+        var shaderTypeStr;
+        if (type == gl.FRAGMENT_SHADER) {
+            shaderTypeStr = 'Fragment shader';
+        } else {
+            shaderTypeStr = 'Vertex shader';
+        }
+        if (gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
+            shaderType.textContent = shaderTypeStr;
+            var translatedSource = debugShaders.getTranslatedShaderSource(shader);
+            output.value = translatedSource;
+            infoLog.value = gl.getShaderInfoLog(shader);
+            return true;
+        } else {
+            infoLog.value += 'Info log when compiling as ' + shaderTypeStr + ':\n' + gl.getShaderInfoLog(shader) + '\n';
+            return false;
+        }
+    }
+
+    if (!tryCompile(gl.FRAGMENT_SHADER) && !tryCompile(gl.VERTEX_SHADER)) {
+        output.value = 'Invalid shader, compilation failed as both fragment and vertex shader.';
+        shaderType.textContent = 'Shader not';
+    }
+}
+</script>
+</head>
+<body>
+<h1>WebGL Shader Translator</h1>
+<p>This page uses the browser's built-in shader translation facilities to show how a shader
+is changed before being passed on to the underlying platform's graphics driver.</p>
+<p id="disabled" style="display: none;">
+    WebGL or WEBGL_debug_shaders extension is not available on this browser configuration.
+    Use a different browser or look for other alternatives to enable the extension to be able to use this page.
+    The extension might be behind a runtime flag for privacy considerations.
+</p>
+<h2>WebGL GLSL shader</h2>
+<textarea id="original-shader"></textarea>
+<p>
+<input type="button" id="translate" value="Translate" onclick="translateShader()"></input>
+<input type="button" id="getExts" value="Enable supported GLSL extensions" onclick="getExtensions()"></input>
+</p>
+<h2><span id="shader-type">Shader</span> translated for graphics driver</h2>
+<textarea id="translated-shader"></textarea>
+<h2>Enabled shader extensions</h2>
+<p id="enabled-extensions">None</p>
+<h2>Shader info log</h2>
+<textarea id="info-log"></textarea>
+</body>
+</html>
+