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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/extensions/ext-shader-texture-lod.html b/dom/canvas/test/webgl-conf/checkout/conformance/extensions/ext-shader-texture-lod.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>WebGL EXT_shader_texture_lod Conformance Tests</title>
+<link rel="stylesheet" href="../../resources/js-test-style.css"/>
+<script src="../../js/desktop-gl-constants.js"></script>
+<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: 256px; height: 256px;"> </canvas>
+<canvas id="canvas2" style="width: 256px; height: 256px;"> </canvas>
+<div id="console"></div>
+<!-- Shaders for testing texture LOD functions -->
+
+<!-- Shader omitting the required #extension pragma -->
+<script id="missingPragmaFragmentShader" type="x-shader/x-fragment">
+precision mediump float;
+varying vec2 texCoord0v;
+uniform float lod;
+uniform sampler2D tex;
+void main() {
+    vec4 color = texture2DLodEXT(tex, texCoord0v, lod);
+    gl_FragColor = color;
+}
+</script>
+
+<!-- Shader to test macro definition -->
+<script id="macroFragmentShader" type="x-shader/x-fragment">
+precision mediump float;
+void main() {
+#ifdef GL_EXT_shader_texture_lod
+    gl_FragColor = vec4(0.0, 0.0, 0.0, 0.0);
+#else
+    // Error expected
+    #error no GL_EXT_shader_texture_lod;
+#endif
+}
+</script>
+
+<!-- Shader with required #extension pragma -->
+<script id="testFragmentShader" type="x-shader/x-fragment">
+#extension GL_EXT_shader_texture_lod : enable
+precision mediump float;
+varying vec2 texCoord0v;
+uniform float lod;
+uniform sampler2D tex;
+void main() {
+    vec4 color = texture2DLodEXT(tex, texCoord0v, lod);
+    gl_FragColor = color;
+}
+</script>
+
+<!-- Shaders to link with test fragment shaders -->
+<script id="goodVertexShader" type="x-shader/x-vertex">
+attribute vec4 vPosition;
+attribute vec2 texCoord0;
+varying vec2 texCoord0v;
+void main() {
+    texCoord0v = texCoord0;
+    gl_Position = vPosition;
+}
+</script>
+
+<!-- Shaders to test output -->
+<script id="outputVertexShader" type="x-shader/x-vertex">
+attribute vec4 vPosition;
+attribute vec2 texCoord0;
+varying vec2 texCoord0v;
+void main() {
+    texCoord0v = texCoord0;
+    gl_Position = vPosition;
+}
+</script>
+<script id="outputFragmentShader" type="x-shader/x-fragment">
+#extension GL_EXT_shader_texture_lod : require
+precision mediump float;
+varying vec2 texCoord0v;
+uniform float lod;
+uniform sampler2D tex;
+void main() {
+    vec4 color = texture2DLodEXT(tex, texCoord0v, lod);
+    gl_FragColor = color;
+}
+</script>
+
+<script>
+description("This test verifies the functionality of the EXT_shader_texture_lod extension, if it is available.");
+
+debug("");
+
+var wtu = WebGLTestUtils;
+var canvas = document.getElementById("canvas");
+var gl = wtu.create3DContext(canvas);
+var ext = null;
+
+// Run all tests once.
+runAllTests();
+
+// Run all tests against with a new context to test for any cache issues.
+debug("");
+debug("Testing new context to catch cache errors");
+var canvas2 = document.getElementById("canvas2");
+gl = wtu.create3DContext(canvas2);
+ext = null;
+runAllTests();
+
+function runAllTests() {
+    if (!gl) {
+        testFailed("WebGL context does not exist");
+    } else {
+        testPassed("WebGL context exists");
+
+        // Run tests with extension disabled
+        runShaderTests(false);
+
+        // Query the extension and store globally so shouldBe can access it
+        ext = gl.getExtension("EXT_shader_texture_lod");
+        if (!ext) {
+            testPassed("No EXT_shader_texture_lod support -- this is legal");
+
+            runSupportedTest(false);
+        } else {
+            testPassed("Successfully enabled EXT_shader_texture_lod extension");
+
+            runSupportedTest(true);
+
+            runShaderTests(true);
+            runOutputTests();
+            runUniqueObjectTest();
+            runReferenceCycleTest();
+
+            // Run deferred link tests.
+            runDeferredLinkTests();
+        }
+    }
+
+}
+
+function runSupportedTest(extensionEnabled) {
+    var supported = gl.getSupportedExtensions();
+    if (supported.indexOf("EXT_shader_texture_lod") >= 0) {
+        if (extensionEnabled) {
+            testPassed("EXT_shader_texture_lod listed as supported and getExtension succeeded");
+        } else {
+            testFailed("EXT_shader_texture_lod listed as supported but getExtension failed");
+        }
+    } else {
+        if (extensionEnabled) {
+            testFailed("EXT_shader_texture_lod not listed as supported but getExtension succeeded");
+        } else {
+            testPassed("EXT_shader_texture_lod not listed as supported and getExtension failed -- this is legal");
+        }
+    }
+}
+
+function runShaderTests(extensionEnabled) {
+    debug("");
+    debug("Testing various shader compiles with extension " + (extensionEnabled ? "enabled" : "disabled"));
+
+    // Expect the macro shader to succeed ONLY if enabled
+    var macroFragmentProgram = wtu.loadProgramFromScriptExpectError(gl, "goodVertexShader", "macroFragmentShader");
+    if (extensionEnabled) {
+        if (macroFragmentProgram) {
+            // Expected result
+            testPassed("GL_EXT_shader_texture_lod defined in shaders when extension is enabled");
+        } else {
+            testFailed("GL_EXT_shader_texture_lod not defined in shaders when extension is enabled");
+        }
+    } else {
+        if (macroFragmentProgram) {
+            testFailed("GL_EXT_shader_texture_lod defined in shaders when extension is disabled");
+        } else {
+            testPassed("GL_EXT_shader_texture_lod not defined in shaders when extension disabled");
+        }
+    }
+
+    // Always expect the shader missing the #pragma to fail (whether enabled or not)
+    var missingPragmaFragmentProgram = wtu.loadProgramFromScriptExpectError(gl, "goodVertexShader", "missingPragmaFragmentShader");
+    if (missingPragmaFragmentProgram) {
+        testFailed("Shader built-ins allowed without #extension pragma");
+    } else {
+        testPassed("Shader built-ins disallowed without #extension pragma");
+    }
+
+    // Try to compile a shader using the built-ins that should only succeed if enabled
+    var testFragmentProgram = wtu.loadProgramFromScriptExpectError(gl, "goodVertexShader", "testFragmentShader");
+    if (extensionEnabled) {
+        if (testFragmentProgram) {
+            testPassed("Shader built-ins compiled successfully when extension enabled");
+        } else {
+            testFailed("Shader built-ins failed to compile when extension enabled");
+        }
+    } else {
+        if (testFragmentProgram) {
+            testFailed("Shader built-ins compiled successfully when extension disabled");
+        } else {
+            testPassed("Shader built-ins failed to compile when extension disabled");
+        }
+    }
+}
+
+function runOutputTests() {
+    debug("");
+    debug("Testing various draws for valid built-in function behavior");
+    gl.viewport(0, 0, canvas.width, canvas.height);
+
+    var program = wtu.setupProgram(gl, ["outputVertexShader", "outputFragmentShader"], ['vPosition', 'texCoord0'], [0, 1]);
+    var quadParameters = wtu.setupUnitQuad(gl, 0, 1);
+
+    var colors = [
+        {name: 'red', color:[255, 0, 0, 255]},
+        {name: 'green', color:[0, 255, 0, 255]},
+        {name: 'blue', color:[0, 0, 255, 255]},
+        {name: 'yellow', color:[255, 255, 0, 255]},
+        {name: 'magenta', color:[255, 0, 255, 255]},
+        {name: 'cyan', color:[0, 255, 255, 255]},
+        {name: 'pink', color:[255, 128, 128, 255]},
+        {name: 'gray', color:[128, 128, 128, 255]},
+        {name: 'light green', color:[128, 255, 128, 255]},
+    ];
+
+    var tex = gl.createTexture();
+    gl.bindTexture(gl.TEXTURE_2D, tex);
+    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST_MIPMAP_LINEAR);
+    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
+    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.REPEAT);
+    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.REPEAT);
+
+    for (var ii = 0; ii < colors.length; ++ii) {
+        var color = colors[ii];
+        var size = Math.pow(2, colors.length - ii - 1);
+        wtu.fillTexture(gl, tex, size, size, color.color, ii);
+    }
+
+    var loc = gl.getUniformLocation(program, "lod");
+
+    for (var ii = 0; ii < colors.length; ++ii) {
+        gl.uniform1f(loc, ii);
+        var color = colors[ii];
+        wtu.drawUnitQuad(gl);
+        wtu.checkCanvas(
+            gl, color.color,
+            "256x256 texture drawn to 256x256 dest with lod = " + ii +
+            " should be " + color.name);
+    }
+
+    wtu.glErrorShouldBe(gl, gl.NO_ERROR);
+}
+
+function runUniqueObjectTest()
+{
+    debug("");
+    debug("Testing that getExtension() returns the same object each time");
+    ext = null;
+    gl.getExtension("EXT_shader_texture_lod").myProperty = 2;
+    webglHarnessCollectGarbage();
+    shouldBe('gl.getExtension("EXT_shader_texture_lod").myProperty', '2');
+}
+
+function runReferenceCycleTest()
+{
+    // create some reference cycles. The goal is to see if they cause leaks. The point is that
+    // some browser test runners have instrumentation to detect leaked refcounted objects.
+    debug("");
+    debug("Testing reference cycles between context and extension objects");
+    var ext = gl.getExtension("EXT_shader_texture_lod");
+
+    // create cycle between extension and context, since the context has to hold a reference to the extension
+    ext.context = gl;
+
+    // create a self-cycle on the extension object
+    ext.ext = ext;
+}
+
+function runDeferredLinkTests() {
+    debug("");
+    debug("Testing deferred shader compilation tests.");
+
+    // Test for compilation failures that are caused by missing extensions
+    // do not succeed if extensions are enabled during linking. This would
+    // only happen for deferred shader compilations.
+
+    // First test if link succeeds with extension enabled.
+    var glEnabled = wtu.create3DContext();
+    var extEnabled = glEnabled.getExtension("EXT_shader_texture_lod");
+    if (!extEnabled) {
+        testFailed("Deferred link test expects the extension to be supported");
+    }
+
+    var vertexShader = wtu.loadShaderFromScript(glEnabled, "goodVertexShader");
+    var fragmentShader = wtu.loadShaderFromScript(glEnabled, "macroFragmentShader");
+
+    if (!vertexShader || !fragmentShader) {
+        testFailed("Could not create good shaders.");
+        return;
+    }
+
+    var program = wtu.setupProgram(glEnabled, [vertexShader, fragmentShader]);
+
+    if (!program) {
+        testFailed("Compilation with extension enabled failed.");
+        return;
+    }
+
+    // Create new context to test link failure without extension enabled.
+    var glDeferred = wtu.create3DContext();
+
+    var vertexShader = wtu.loadShaderFromScript(glDeferred, "goodVertexShader", glDeferred.VERTEX_SHADER, undefined, undefined, true);
+    var fragmentShader = wtu.loadShaderFromScript(glDeferred, "macroFragmentShader", glDeferred.FRAGMENT_SHADER, undefined, undefined, true);
+
+    if (vertexShader == null || fragmentShader == null) {
+        testFailed("Could not create shaders.");
+        return;
+    }
+
+    // Shader compilations should have failed due to extensions not enabled.
+    glDeferred.getExtension("EXT_shader_texture_lod");
+    var program = wtu.setupProgram(glDeferred, [vertexShader, fragmentShader]);
+    if (program) {
+        testFailed("Compilation with extension disabled then linking with extension enabled should have failed.");
+        return;
+    }
+
+    testPassed("Compilation with extension disabled then linking with extension enabled.");
+}
+
+debug("");
+successfullyParsed = true;
+</script>
+<script src="../../js/js-test-post.js"></script>
+
+</body>
+</html>