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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance2/glsl3/texture-offset-out-of-range.html b/dom/canvas/test/webgl-conf/checkout/conformance2/glsl3/texture-offset-out-of-range.html
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+++ b/dom/canvas/test/webgl-conf/checkout/conformance2/glsl3/texture-offset-out-of-range.html
@@ -0,0 +1,106 @@
+<!--
+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>GLSL out-of-range texture offset test</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>
+<script src="../../js/glsl-conformance-test.js"></script>
+</head>
+<body>
+<div id="description"></div>
+<div id="console"></div>
+<script id="vshaderInvalidOffset" type="x-shader/x-vertex">#version 300 es
+in vec4 a_position;
+in vec2 a_in0;
+out vec2 v_texCoord;
+
+void main()
+{
+    gl_Position = a_position;
+    v_texCoord = a_in0;
+}
+</script>
+<script id="fshaderInvalidOffset" type="x-shader/x-fragment">#version 300 es
+precision mediump float;
+
+in vec2 v_texCoord;
+out vec4 my_FragColor;
+uniform sampler2D u_sampler;
+uniform int x;
+
+void main() {
+    my_FragColor = textureOffset(u_sampler, v_texCoord, ivec2(0, $(yoffset)));
+}
+</script>
+<script type="application/javascript">
+"use strict";
+description("Out-of-range texture offset should not compile.");
+
+var wtu = WebGLTestUtils;
+
+var vshader = wtu.getScript('vshaderInvalidOffset');
+var fshaderTemplate = wtu.getScript('fshaderInvalidOffset');
+
+var gl = wtu.create3DContext(undefined, undefined, 2);
+
+if (!gl) {
+    testFailed("Unable to initialize WebGL 2.0 context.");
+} else {
+    var minOffset = gl.getParameter(gl.MIN_PROGRAM_TEXEL_OFFSET);
+    var maxOffset = gl.getParameter(gl.MAX_PROGRAM_TEXEL_OFFSET);
+
+    var shaderSrcValidMin = wtu.replaceParams(fshaderTemplate, {'yoffset': minOffset});
+    var shaderSrcValidMax = wtu.replaceParams(fshaderTemplate, {'yoffset': maxOffset});
+    var shaderSrcBelowMin = wtu.replaceParams(fshaderTemplate, {'yoffset': (minOffset - 1)});
+    var shaderSrcAboveMax = wtu.replaceParams(fshaderTemplate, {'yoffset': (maxOffset + 1)});
+    var shaderSrcDynamic = wtu.replaceParams(fshaderTemplate, {'yoffset': 'x'});
+
+    GLSLConformanceTester.runTests([
+    {
+        vShaderSource: vshader,
+        fShaderSource: shaderSrcValidMin,
+        fShaderSuccess: true,
+        linkSuccess: true,
+        passMsg: 'Minimum in-range texture offset should compile'
+    },
+    {
+        vShaderSource: vshader,
+        fShaderSource: shaderSrcValidMax,
+        fShaderSuccess: true,
+        linkSuccess: true,
+        passMsg: 'Maximum in-range texture offset should compile'
+    },
+    {
+        vShaderSource: vshader,
+        fShaderSource: shaderSrcBelowMin,
+        fShaderSuccess: false,
+        linkSuccess: false,
+        passMsg: 'Texture offset below minimum valid value should not compile'
+    },
+    {
+        vShaderSource: vshader,
+        fShaderSource: shaderSrcAboveMax,
+        fShaderSuccess: false,
+        linkSuccess: false,
+        passMsg: 'Texture offset above maximum valid value should not compile'
+    },
+    {
+        vShaderSource: vshader,
+        fShaderSource: shaderSrcDynamic,
+        fShaderSuccess: false,
+        linkSuccess: false,
+        passMsg: 'Dynamic texture offset should not compile'
+    }
+    ], 2);
+}
+</script>
+</body>
+</html>