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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/attribs/gl-bindAttribLocation-matrix.html b/dom/canvas/test/webgl-conf/checkout/conformance/attribs/gl-bindAttribLocation-matrix.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">
+<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>
+<title>WebGL bindAttribLocation with Matrix Attributes Conformance Test</title>
+</head>
+<body>
+<div id="description"></div>
+<div id="console"></div>
+<canvas id="canvas" width="8" height="8" style="width: 8px; height: 8px;"></canvas>
+<script>
+"use strict";
+description("This test verifies that vectors placed via bindAttribLocation right after matricies will fail if there is insufficient room for the matrix.");
+
+var wtu = WebGLTestUtils;
+var canvas = document.getElementById("canvas");
+var gl = wtu.create3DContext(canvas, {antialias: false});
+
+// Make sure we have room for at least a mat4.
+var maxAttributes = gl.getParameter(gl.MAX_VERTEX_ATTRIBS);
+debug('MAX_VERTEX_ATTRIBUTES is ' + maxAttributes);
+shouldBeGreaterThanOrEqual('maxAttributes', '4');
+
+var glFragmentShader = wtu.loadShader(gl, wtu.simpleColorFragmentShader, gl.FRAGMENT_SHADER);
+
+// Given a matrix dimension, load a vertex shader with a matrix of that dimension
+// and a vector. Ensure that both the vector and matrix are active attributes.
+// Return the compiled vertex shader.
+function loadVertexShader(numMatrixDimensions) {
+    var strVertexShader =
+        'attribute mat' + numMatrixDimensions + ' matrix;\n' +
+        'attribute vec' + numMatrixDimensions + ' vector;\n' +
+        'void main(void) { gl_Position = vec4(vector*matrix';
+    // Ensure the vec4 has the correct number of dimensions in order to be assignable
+    // to gl_Position.
+    for (var ii = numMatrixDimensions; ii < 4; ++ii) {
+        strVertexShader += ",0.0";
+    }
+    strVertexShader += ");}\n";
+    return wtu.loadShader(gl, strVertexShader, gl.VERTEX_SHADER);
+}
+
+// Given a vertex shader, matrix location and vector location, create and link
+// a program with glFragmentShader and a vertex shader returned by loadVertexShader
+// attached. Bind the matrix to matrixLocation and the vector to vectorLocation.
+// Return whether the link was successful.
+function createAndLinkProgram(glVertexShader, matrixLocation, vectorLocation) {
+    var glProgram = gl.createProgram();
+    gl.bindAttribLocation(glProgram, matrixLocation, 'matrix');
+    gl.bindAttribLocation(glProgram, vectorLocation, 'vector');
+    gl.attachShader(glProgram, glVertexShader);
+    gl.attachShader(glProgram, glFragmentShader);
+    gl.linkProgram(glProgram);
+    return gl.getProgramParameter(glProgram, gl.LINK_STATUS);
+}
+
+// For each matrix dimension (mat2, mat3 and mat4)
+for (var mm = 2; mm <= 4; ++mm) {
+    debug('Testing ' + mm + ' dimensional matrices');
+    var glVertexShader = loadVertexShader(mm);
+    // Per the WebGL spec: "LinkProgram will fail if the attribute bindings assigned
+    // by bindAttribLocation do not leave enough space to assign a location for an
+    // active matrix attribute which requires multiple contiguous generic attributes."
+    // We will test this by placing the vector after the matrix attribute such that there
+    // is not enough room for the matrix. Vertify the link operation fails.
+
+    // Run the test for each available attribute slot.  Go to maxAttributes-mm to leave enough room
+    // for the matrix itself. Leave another slot open for the vector following the matrix.
+    for (var pp = 0; pp <= maxAttributes - mm - 1; ++pp) {
+        // For each matrix dimension, bind the vector right after the matrix such that we leave
+        // insufficient room for the matrix. Verify doing this will fail the link operation.
+        for (var ll = 0; ll < mm; ++ll) {
+            var vectorLocation = pp + ll;
+            assertMsg(!createAndLinkProgram(glVertexShader, /*matrixLocation*/pp, vectorLocation),
+                "Matrix with location " + pp + " and vector with location " + vectorLocation + " should not link.");
+        }
+        // Ensure that once we have left enough room for the matrix, the program links successfully.
+        var vectorLocation = pp + ll;
+        assertMsg(createAndLinkProgram(glVertexShader, /*matrixLocation*/pp, vectorLocation),
+            "Matrix with location " + pp + " and vector with location " + vectorLocation + " should link.");
+        debug('');
+    }
+    debug('');
+}
+
+var successfullyParsed = true;
+</script>
+<script src="../../js/js-test-post.js"></script>
+</body>
+</html>