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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/rendering/gl-scissor-canvas-dimensions.html b/dom/canvas/test/webgl-conf/checkout/conformance/rendering/gl-scissor-canvas-dimensions.html
new file mode 100644
index 0000000000..6e2f2baf30
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+++ b/dom/canvas/test/webgl-conf/checkout/conformance/rendering/gl-scissor-canvas-dimensions.html
@@ -0,0 +1,78 @@
+<!--
+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 Scissor Canvas Dimensions 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>
+<style>
+canvas {
+    border: 1px solid #000;
+    width: 64px;
+    height: 64px;
+}
+</style>
+</head>
+<body>
+<canvas id="canvas1" width="16" height="16"> </canvas>
+<canvas id="canvas2" width="16" height="16"> </canvas>
+<div id="description"></div>
+<div id="console"></div>
+<script>
+"use strict";
+description("Check that scissoring is initially disabled and that the scissor rect does not change when canvas size changes.");
+
+var wtu = WebGLTestUtils;
+
+function testInit(canvas, attribs) {
+  var gl = wtu.create3DContext(canvas, attribs);
+  if (!gl) {
+    testFailed("context does not exist");
+    return;
+  }
+  debug("Testing that scissor test is initially disabled");
+  // Setting the scissor rect should have no effect on drawing.
+  gl.scissor(0, 0, 1, 1);
+  gl.clearColor(0, 1, 0, 1);
+  gl.clear(gl.COLOR_BUFFER_BIT);
+  wtu.glErrorShouldBe(gl, gl.NO_ERROR, "there should be no errors");
+  wtu.checkCanvasRect(gl, 0, 0, canvas.width, canvas.height, [0, 255, 0, 255], "whole canvas should be green");
+}
+
+function testCanvasSizeChange(canvas, attribs) {
+  var gl = wtu.create3DContext(canvas, attribs);
+  if (!gl) {
+    testFailed("context does not exist");
+    return;
+  }
+  debug("Testing that scissor rect dimensions do not change if the canvas is resized.");
+  canvas.width = 32;
+  canvas.height = 32;
+  gl.viewport(0, 0, 32, 32);
+  gl.enable(gl.SCISSOR_TEST);
+  gl.clearColor(0, 1, 0, 1);
+  gl.clear(gl.COLOR_BUFFER_BIT);
+  wtu.glErrorShouldBe(gl, gl.NO_ERROR, "there should be no errors");
+  wtu.checkCanvasRect(gl, 0, 0, 16, 16, [0, 255, 0, 255], "area inside scissor should be green");
+  wtu.checkCanvasRect(gl, 0, 16, 32, 16, [0, 0, 0, 0], "area outside scissor should be black");
+  wtu.checkCanvasRect(gl, 16, 0, 16, 16, [0, 0, 0, 0], "area outside scissor should be black");
+}
+
+testInit(document.getElementById("canvas1"), {antialias: false});
+debug("");
+testCanvasSizeChange(document.getElementById("canvas2"), {antialias: false});
+
+var successfullyParsed = true;
+
+</script>
+<script src="../../js/js-test-post.js"></script>
+
+</body>
+</html>