1 files changed, 44 insertions, 0 deletions
diff --git a/dom/canvas/test/test_bug902651.html b/dom/canvas/test/test_bug902651.html
new file mode 100644
index 0000000000..2491138012
--- /dev/null
+++ b/dom/canvas/test/test_bug902651.html
@@ -0,0 +1,44 @@
+<!DOCTYPE HTML>
+<title>Canvas test: canvas demotion</title>
+<script src="/tests/SimpleTest/SimpleTest.js"></script>
+<link rel="stylesheet" href="/tests/SimpleTest/test.css">
+<body>
+<canvas id="c" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
+<script>
+
+SimpleTest.waitForExplicitFinish();
+SimpleTest.requestFlakyTimeout("untriaged");
+addLoadEvent(function () {
+
+var canvas = document.getElementById('c');
+var ctx = canvas.getContext('2d');
+
+ctx.fillStyle = 'rgb(50, 50, 50)';
+ctx.fillRect(0, 0, 100, 50);
+ctx.translate(25, 25);
+
+SpecialPowers.wrap(ctx).demote();
+
+setTimeout(function() {
+  ctx.fillStyle = 'rgb(127, 127, 127)';
+  ctx.fillRect(0, 0, 10, 10);
+
+  var pixels = ctx.getImageData(0, 0, 1, 1);
+
+  ok(pixels.data[0] === 50, "pixels.data[0] expected 50, got " + pixels.data[0]);
+  ok(pixels.data[1] === 50, "pixels.data[1] expected 50, got " + pixels.data[1]);
+  ok(pixels.data[2] === 50, "pixels.data[2] expected 50, got " + pixels.data[2]);
+
+  pixels = ctx.getImageData(25, 25, 1, 1);
+
+  ok(pixels.data[0] === 127, "pixels.data[0] expected 127, got " + pixels.data[0]);
+  ok(pixels.data[1] === 127, "pixels.data[1] expected 127, got " + pixels.data[1]);
+  ok(pixels.data[2] === 127, "pixels.data[2] expected 127, got " + pixels.data[2]);
+
+  SimpleTest.finish();
+}, 50);
+
+
+});
+</script>
+