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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/extensions/ext-blend-minmax.html b/dom/canvas/test/webgl-conf/checkout/conformance/extensions/ext-blend-minmax.html
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@@ -0,0 +1,225 @@
+<!--
+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_blend_minmax 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: 50px; height: 50px;"> </canvas>
+<div id="console"></div>
+<!-- Shaders to test output -->
+<script id="outputVertexShader" type="x-shader/x-vertex">
+attribute vec4 vPosition;
+void main() {
+    gl_Position = vPosition;
+}
+</script>
+<script id="outputFragmentShader" type="x-shader/x-fragment">
+precision mediump float;
+uniform vec4 uColor;
+void main() {
+    gl_FragColor = uColor;
+}
+</script>
+
+<script>
+"use strict";
+description("This test verifies the functionality of the EXT_blend_minmax extension, if it is available.");
+
+debug("");
+
+var wtu = WebGLTestUtils;
+var canvas = document.getElementById("canvas");
+var gl = wtu.create3DContext(canvas);
+var ext = null;
+
+// Use the constant directly when we don't have the extension
+var MIN_EXT = 0x8007;
+var MAX_EXT = 0x8008;
+
+if (!gl) {
+    testFailed("WebGL context does not exist");
+} else {
+    testPassed("WebGL context exists");
+
+    runBlendTestDisabled();
+
+    // Query the extension and store globally so shouldBe can access it
+    ext = wtu.getExtensionWithKnownPrefixes(gl, "EXT_blend_minmax");
+    if (!ext) {
+        testPassed("No EXT_blend_minmax support -- this is legal");
+
+        runSupportedTest(false);
+    } else {
+        debug("");
+        testPassed("Successfully enabled EXT_blend_minmax extension");
+
+        runSupportedTest(true);
+
+        runBlendTestEnabled();
+        runOutputTests();
+        runUniqueObjectTest();
+    }
+}
+
+function runSupportedTest(extensionEnabled) {
+    var supported = gl.getSupportedExtensions();
+    if (supported.indexOf("EXT_blend_minmax") >= 0) {
+        if (extensionEnabled) {
+            testPassed("EXT_blend_minmax listed as supported and getExtension succeeded");
+        } else {
+            testFailed("EXT_blend_minmax listed as supported but getExtension failed");
+        }
+    } else {
+        if (extensionEnabled) {
+            testFailed("EXT_blend_minmax not listed as supported but getExtension succeeded");
+        } else {
+            testPassed("EXT_blend_minmax not listed as supported and getExtension failed -- this is legal");
+        }
+    }
+}
+
+function runBlendTestDisabled() {
+    debug("");
+    debug("Testing blending enums with extension disabled");
+
+    // Set the blend equation to a known-good enum first
+    gl.blendEquation(gl.FUNC_ADD);
+
+    wtu.shouldGenerateGLError(gl, gl.INVALID_ENUM, "gl.blendEquation(MIN_EXT)");
+    shouldBe("gl.getParameter(gl.BLEND_EQUATION)", "gl.FUNC_ADD");
+
+    wtu.shouldGenerateGLError(gl, gl.INVALID_ENUM, "gl.blendEquation(MAX_EXT)");
+    shouldBe("gl.getParameter(gl.BLEND_EQUATION)", "gl.FUNC_ADD");
+
+    wtu.shouldGenerateGLError(gl, gl.INVALID_ENUM, "gl.blendEquationSeparate(MIN_EXT, gl.FUNC_ADD)");
+    shouldBe("gl.getParameter(gl.BLEND_EQUATION_RGB)", "gl.FUNC_ADD");
+
+    wtu.shouldGenerateGLError(gl, gl.INVALID_ENUM, "gl.blendEquationSeparate(gl.FUNC_ADD, MIN_EXT)");
+    shouldBe("gl.getParameter(gl.BLEND_EQUATION_ALPHA)", "gl.FUNC_ADD");
+
+    wtu.shouldGenerateGLError(gl, gl.INVALID_ENUM, "gl.blendEquationSeparate(MAX_EXT, gl.FUNC_ADD)");
+    shouldBe("gl.getParameter(gl.BLEND_EQUATION_RGB)", "gl.FUNC_ADD");
+
+    wtu.shouldGenerateGLError(gl, gl.INVALID_ENUM, "gl.blendEquationSeparate(gl.FUNC_ADD, MAX_EXT)");
+    shouldBe("gl.getParameter(gl.BLEND_EQUATION_ALPHA)", "gl.FUNC_ADD");
+}
+
+function runBlendTestEnabled() {
+    debug("");
+    debug("Testing blending enums with extension enabled");
+
+    shouldBe("ext.MIN_EXT", "0x8007");
+    shouldBe("ext.MAX_EXT", "0x8008");
+
+    wtu.shouldGenerateGLError(gl, gl.NO_ERROR, "gl.blendEquation(ext.MIN_EXT)");
+    shouldBe("gl.getParameter(gl.BLEND_EQUATION)", "ext.MIN_EXT");
+
+    wtu.shouldGenerateGLError(gl, gl.NO_ERROR, "gl.blendEquation(ext.MAX_EXT)");
+    shouldBe("gl.getParameter(gl.BLEND_EQUATION)", "ext.MAX_EXT");
+
+    wtu.shouldGenerateGLError(gl, gl.NO_ERROR, "gl.blendEquationSeparate(ext.MIN_EXT, gl.FUNC_ADD)");
+    shouldBe("gl.getParameter(gl.BLEND_EQUATION_RGB)", "ext.MIN_EXT");
+    shouldBe("gl.getParameter(gl.BLEND_EQUATION_ALPHA)", "gl.FUNC_ADD");
+
+    wtu.shouldGenerateGLError(gl, gl.NO_ERROR, "gl.blendEquationSeparate(gl.FUNC_ADD, ext.MIN_EXT)");
+    shouldBe("gl.getParameter(gl.BLEND_EQUATION_RGB)", "gl.FUNC_ADD");
+    shouldBe("gl.getParameter(gl.BLEND_EQUATION_ALPHA)", "ext.MIN_EXT");
+
+    wtu.shouldGenerateGLError(gl, gl.NO_ERROR, "gl.blendEquationSeparate(ext.MAX_EXT, gl.FUNC_ADD)");
+    shouldBe("gl.getParameter(gl.BLEND_EQUATION_RGB)", "ext.MAX_EXT");
+    shouldBe("gl.getParameter(gl.BLEND_EQUATION_ALPHA)", "gl.FUNC_ADD");
+
+    wtu.shouldGenerateGLError(gl, gl.NO_ERROR, "gl.blendEquationSeparate(gl.FUNC_ADD, ext.MAX_EXT)");
+    shouldBe("gl.getParameter(gl.BLEND_EQUATION_RGB)", "gl.FUNC_ADD");
+    shouldBe("gl.getParameter(gl.BLEND_EQUATION_ALPHA)", "ext.MAX_EXT");
+}
+
+function runOutputTests() {
+    var e = 2; // Amount of variance to allow in result pixels - may need to be tweaked higher
+
+    debug("");
+    debug("Testing various draws for valid blending behavior");
+
+    canvas.width = 50; canvas.height = 50;
+    gl.viewport(0, 0, canvas.width, canvas.height);
+    gl.enable(gl.BLEND);
+    gl.blendFunc(gl.ONE, gl.ONE);
+
+    var program = wtu.setupProgram(gl, ["outputVertexShader", "outputFragmentShader"], ['vPosition'], [0]);
+    var quadParameters = wtu.setupUnitQuad(gl, 0, 1);
+    var colorUniform = gl.getUniformLocation(program, "uColor");
+
+
+    // Draw 1
+    gl.blendEquation(ext.MIN_EXT);
+
+    gl.clearColor(0.2, 0.4, 0.6, 0.8);
+    gl.clear(gl.COLOR_BUFFER_BIT);
+
+    gl.uniform4f(colorUniform, 0.8, 0.6, 0.4, 0.2);
+    wtu.drawUnitQuad(gl);
+
+    wtu.checkCanvasRect(gl, 0, 0, canvas.width, canvas.height, [51, 102, 102, 51]);
+
+    // Draw 2:
+    gl.blendEquation(ext.MAX_EXT);
+
+    gl.clearColor(0.2, 0.4, 0.6, 0.8);
+    gl.clear(gl.COLOR_BUFFER_BIT);
+
+    gl.uniform4f(colorUniform, 0.8, 0.6, 0.4, 0.2);
+    wtu.drawUnitQuad(gl);
+
+    wtu.checkCanvasRect(gl, 0, 0, canvas.width, canvas.height, [204, 153, 153, 204]);
+
+    // Draw 3
+    gl.blendEquationSeparate(ext.MIN_EXT, ext.MAX_EXT);
+
+    gl.clearColor(0.2, 0.4, 0.6, 0.8);
+    gl.clear(gl.COLOR_BUFFER_BIT);
+
+    gl.uniform4f(colorUniform, 0.8, 0.6, 0.4, 0.2);
+    wtu.drawUnitQuad(gl);
+
+    wtu.checkCanvasRect(gl, 0, 0, canvas.width, canvas.height, [51, 102, 102, 204]);
+
+    // Draw 4
+    gl.blendEquationSeparate(ext.MAX_EXT, ext.MIN_EXT);
+
+    gl.clearColor(0.2, 0.4, 0.6, 0.8);
+    gl.clear(gl.COLOR_BUFFER_BIT);
+
+    gl.uniform4f(colorUniform, 0.8, 0.6, 0.4, 0.2);
+    wtu.drawUnitQuad(gl);
+
+    wtu.checkCanvasRect(gl, 0, 0, canvas.width, canvas.height, [204, 153, 153, 51]);
+}
+
+function runUniqueObjectTest()
+{
+    debug("");
+    debug("Testing that getExtension() returns the same object each time");
+    ext = null;
+    gl.getExtension("EXT_blend_minmax").myProperty = 2;
+    webglHarnessCollectGarbage();
+    shouldBe('gl.getExtension("EXT_blend_minmax").myProperty', '2');
+}
+
+debug("");
+var successfullyParsed = true;
+</script>
+<script src="../../js/js-test-post.js"></script>
+
+</body>
+</html>