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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/extensions/webgl-debug-shaders.html b/dom/canvas/test/webgl-conf/checkout/conformance/extensions/webgl-debug-shaders.html
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@@ -0,0 +1,144 @@
+<!--
+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 WebGL_debug_shaders Conformance Tests</title>
+<link rel="stylesheet" href="../../resources/js-test-style.css"/>
+<script src="../../js/js-test-pre.js"></script>
+<script src="../../js/webgl-test-utils.js"></script>
+</head>
+<body>
+<div id="description"></div>
+<canvas id="canvas" style="width: 1px; height: 1px;"> </canvas>
+<div id="console"></div>
+<!-- Shaders for testing standard derivatives -->
+
+<script>
+"use strict";
+description("This test verifies the functionality of the WEBGL_debug_shaders extension, if it is available.");
+
+debug("");
+
+var wtu = WebGLTestUtils;
+var gl = wtu.create3DContext("canvas");
+var ext = null;
+var shader = null;
+var program = null;
+var info = null;
+var translatedSource;
+var newTranslatedSource;
+
+if (!gl) {
+    testFailed("WebGL context does not exist");
+} else {
+    testPassed("WebGL context exists");
+
+    // Query the extension and store globally so shouldBe can access it
+    ext = gl.getExtension("WEBGL_debug_shaders");
+    if (!ext) {
+        testPassed("No WEBGL_debug_shaders support -- this is legal");
+
+        runSupportedTest(false);
+    } else {
+        testPassed("Successfully enabled WEBGL_debug_shaders extension");
+
+        runSupportedTest(true);
+        runTestEnabled();
+    }
+}
+
+function runSupportedTest(extensionEnabled) {
+    var supported = gl.getSupportedExtensions();
+    if (supported.indexOf("WEBGL_debug_shaders") >= 0) {
+        if (extensionEnabled) {
+            testPassed("WEBGL_debug_shaders listed as supported and getExtension succeeded");
+        } else {
+            testFailed("WEBGL_debug_shaders listed as supported but getExtension failed");
+        }
+    } else {
+        if (extensionEnabled) {
+            testFailed("WEBGL_debug_shaders not listed as supported but getExtension succeeded");
+        } else {
+            testPassed("WEBGL_debug_shaders not listed as supported and getExtension failed -- this is legal");
+        }
+    }
+}
+
+function runTestEnabled() {
+    debug("Testing function with extension enabled");
+
+    var shaderInfos = [
+      {
+        source: "void main() { gl_Position = vec4(1.0, 0.0, 0.0, 1.0); }",
+        type: gl.VERTEX_SHADER
+      },
+      {
+        source: "void main() { gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0); }",
+        type: gl.FRAGMENT_SHADER
+      }
+    ];
+
+    // Do this twice to test for caching issues.
+    for (var jj = 0; jj < 2; ++jj) {
+        debug("pass:" + (jj + 1));
+        program = gl.createProgram();
+        for (var ii = 0; ii < shaderInfos.length; ++ii) {
+            info = shaderInfos[ii];
+
+            shader = gl.createShader(info.type);
+
+            // if no source has been defined or compileShader() has not been called,
+            // getTranslatedShaderSource() should return an empty string.
+            shouldBe("ext.getTranslatedShaderSource(shader)", '""');
+            gl.shaderSource(shader, info.source);
+            shouldBe("ext.getTranslatedShaderSource(shader)", '""');
+            gl.compileShader(shader);
+            shouldBeTrue("gl.getShaderParameter(shader, gl.COMPILE_STATUS)");
+            translatedSource = ext.getTranslatedShaderSource(shader);
+            wtu.glErrorShouldBe(gl, gl.NO_ERROR, "No gl error should occur");
+            if (translatedSource && translatedSource.length > 0) {
+                testPassed("Successfully called getTranslatedShaderSource()");
+            } else {
+                testFailed("Calling getTranslatedShaderSource() failed");
+            }
+            gl.attachShader(program, shader);
+        }
+        gl.linkProgram(program);
+        shouldBeTrue("gl.getProgramParameter(program, gl.LINK_STATUS)");
+    }
+
+    // Test changing the source. Make sure we get the correct source each time.
+    debug("test changing source");
+    shader = gl.createShader(gl.FRAGMENT_SHADER);
+    gl.shaderSource(shader, "void main() { gl_FragColor = vec4(gl_FragCoord.x, 0.0, 0.0, 1.0); }");
+    gl.compileShader(shader);
+    shouldBeTrue("gl.getShaderParameter(shader, gl.COMPILE_STATUS)");
+    shouldThrow("ext.getTranslatedShaderSource(null)");
+    translatedSource = ext.getTranslatedShaderSource(shader);
+    shouldBeTrue('translatedSource && translatedSource.indexOf("gl_FragCoord") >= 0');
+    // change the source but don't compile.
+    gl.shaderSource(shader, "void main() { gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0); }");
+    // the source should NOT change. It should be the same as the old source.
+    newTranslatedSource = ext.getTranslatedShaderSource(shader);
+    shouldBe('newTranslatedSource', 'translatedSource');
+    // now compile.
+    gl.compileShader(shader);
+    shouldBeTrue("gl.getShaderParameter(shader, gl.COMPILE_STATUS)");
+    // the source should have change.
+    newTranslatedSource = ext.getTranslatedShaderSource(shader);
+    shouldNotBe('newTranslatedSource', 'translatedSource');
+}
+
+debug("");
+var successfullyParsed = true;
+</script>
+<script src="../../js/js-test-post.js"></script>
+
+</body>
+</html>