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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/glsl/bugs/loop-if-loop-gradient.html b/dom/canvas/test/webgl-conf/checkout/conformance/glsl/bugs/loop-if-loop-gradient.html
new file mode 100644
index 0000000000..914604ad07
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+++ b/dom/canvas/test/webgl-conf/checkout/conformance/glsl/bugs/loop-if-loop-gradient.html
@@ -0,0 +1,75 @@
+<!--
+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>Gradient loop in if in loop crash</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 id='vshader' type='x-shader/x-vertex'>
+precision highp float;
+void main() {
+gl_Position = vec4( 1.0, 1.0, 1.0, 1.0 );
+}
+</script>
+<script id='fshader' type='x-shader/x-fragment'>
+precision mediump float;
+uniform lowp sampler2D iChannel0;
+
+void main(){
+    highp float c;
+    for (mediump float i = 0.0; i <= 1.0; i++) {
+        if (gl_FragCoord.x < 0.0) {
+            for (mediump float l = 0.0; l < 2.0; l++) { // with 1 as a bound it works
+                c = texture2D(iChannel0, vec2(l), 0.0).x;
+            }
+        }
+    }
+    gl_FragColor = vec4(c, vec3(1.0));
+}
+</script>
+</head>
+<body>
+<div id="description"></div>
+<div id="console"></div>
+<script>
+"use strict";
+description("This test checks an ANGLE regression that was caused by a complex ShaderToy shader. <a href='https://code.google.com/p/chromium/issues/detail?id=524297'>crbug.com/524297</a>");
+
+debug("");
+
+var wtu = WebGLTestUtils;
+var gl = wtu.create3DContext();
+
+gl.canvas.addEventListener("webglcontextlost", function(e) {
+   testFailed("WebGL context lost");
+});
+
+if (!gl) {
+    testFailed("WebGL context does not exist");
+} else {
+    testPassed("WebGL context exists");
+    debug("");
+
+    var program = wtu.setupProgram(gl, ['vshader', 'fshader']);
+    if (!gl.getProgramParameter(program, gl.LINK_STATUS)) {
+        testFailed("Program failed to link");
+    }
+    wtu.glErrorShouldBe(gl, gl.NO_ERROR, "there should be no errors");
+}
+
+// Cycle through a rAF once to give any webglcontextlost events a chance to propagate
+window.requestAnimationFrame(function() { finishTest(); });
+
+debug("");
+var successfullyParsed = true;
+</script>
+
+</body>
+</html>