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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance2/attribs/gl-vertex-attrib-normalized-int.html b/dom/canvas/test/webgl-conf/checkout/conformance2/attribs/gl-vertex-attrib-normalized-int.html
new file mode 100644
index 0000000000..e1e24be608
--- /dev/null
+++ b/dom/canvas/test/webgl-conf/checkout/conformance2/attribs/gl-vertex-attrib-normalized-int.html
@@ -0,0 +1,80 @@
+<!--
+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>
+    <title>WebGL 2 Normalized Vertex Attributes Conformance Test</title>
+    <meta charset="utf-8">
+    <link rel="stylesheet" href="../../resources/js-test-style.css"/>
+</head>
+<body>
+    <canvas width=1 height=1></canvas>
+    <div id="description"></div>
+    <div id="console"></div>
+    <script id="vertex-shader" type="x-shader/x-vertex">#version 300 es
+        layout(location = 0) in vec3 vertex;
+
+        out float normAttrib;
+
+        void main(void) {
+            gl_Position = vec4(vertex.xy, 0, 1);
+            normAttrib = vertex.z;
+        }
+    </script>
+    <script id="fragment-shader" type="x-shader/x-fragment">#version 300 es
+        in lowp float normAttrib;
+
+        layout(location=0) out lowp vec4 fragColor;
+
+        void main(void) {
+            fragColor = vec4(vec3(normAttrib == -1.0 ? 1.0 : 0.0), 1);
+        }
+    </script>
+    <script src="../../js/js-test-pre.js"></script>
+    <script src="../../js/webgl-test-utils.js"></script>
+    <script>
+        (function () {
+            'use strict';
+
+            var wtu = WebGLTestUtils;
+
+            var gl = wtu.create3DContext(document.querySelector('canvas'), null, 2);
+
+            var program = wtu.setupProgram(gl, ['vertex-shader', 'fragment-shader']);
+
+            gl.useProgram(program);
+
+            var buffer = gl.createBuffer();
+            gl.bindBuffer(gl.ARRAY_BUFFER, buffer);
+            gl.bufferData(gl.ARRAY_BUFFER, new Int8Array([
+                // Here we set the third component (the one that's actually tested)
+                // to (MIN_INT + 1). If non-zero-preserving rules are used, it'll be
+                // converted to a float that's slightly greater than -1. If zero-preserving
+                // rules are used, as the GLES 3 spec requires, result of conversion
+                // should be exactly -1.
+                -0x80,  0x7f, -0x7f,
+                 0x7f,  0x7f, -0x7f,
+                -0x80, -0x7f, -0x7f,
+                -0x80, -0x7f, -0x7f,
+                 0x7f,  0x7f, -0x7f,
+                 0x7f, -0x80, -0x7f
+            ]), gl.STATIC_DRAW);
+
+            gl.enableVertexAttribArray(0);
+            gl.vertexAttribPointer(0, 3, gl.BYTE, true, 0, 0);
+
+            gl.drawArrays(gl.TRIANGLE_STRIP, 0, 6);
+
+            wtu.checkCanvas(gl, [255, 255, 255, 255], "should be opaque white");
+        }());
+    </script>
+    <script>
+        description('Verify that conversion of normalized signed int attributes to floats uses zero-preserving rule.');
+        window.successfullyParsed = true;
+    </script>
+    <script src="../../js/js-test-post.js"></script>
+</body>
+</html>