1 files changed, 48 insertions, 0 deletions
diff --git a/dom/base/test/test_anonymousContent_canvas.html b/dom/base/test/test_anonymousContent_canvas.html
new file mode 100644
index 0000000000..d5a5a1e6c4
--- /dev/null
+++ b/dom/base/test/test_anonymousContent_canvas.html
@@ -0,0 +1,48 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1212477
+-->
+<meta charset="utf-8">
+<title>Test for Bug 1212477 - Needs a way to access to &lt;canvas&gt;'s context (2d, webgl) from Anonymous Content API</title>
+<script src="/tests/SimpleTest/SimpleTest.js"></script>
+<link rel="stylesheet" href="/tests/SimpleTest/test.css"/>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1212477">Mozilla Bug 1212477</a>
+<div>
+  <div id="id" class="test">text content</div>
+  <canvas id="canvas2d"></canvas>
+  <canvas id="canvas-webgl"></canvas>
+  <canvas id="canvas-foo"></canvas>
+</div>
+<script>
+  let chromeDocument = SpecialPowers.wrap(document);
+  let testElement = document.querySelector("div");
+
+  let anonymousContent = chromeDocument.insertAnonymousContent();
+  anonymousContent.root.appendChild(testElement.cloneNode(true));
+
+  let canvas2d = anonymousContent.root.getElementById("canvas2d");
+  let context2d = canvas2d.getContext("2d");
+
+  is(context2d.toString(), "[object CanvasRenderingContext2D]",
+      "2D Context is returned properly");
+
+  is(context2d.canvas, null, "context's canvas property");
+
+  is(anonymousContent.root.getElementById("canvas-foo").getContext("foo"),
+     null,
+     "Context is null for unknown context type");
+
+  const normalWebGL = document.createElement('canvas').getContext('webgl');
+  if (normalWebGL) {
+    let canvasWebGL = anonymousContent.root.getElementById("canvas-webgl");
+    let webgl = canvasWebGL.getContext("webgl");
+
+    is(webgl.toString(), "[object WebGLRenderingContext]",
+        "WebGL Context is returned properly");
+
+    is(webgl.canvas, null,
+        "WebGL context's canvas property is null in anonymous content");
+  }
+  chromeDocument.removeAnonymousContent(anonymousContent);
+</script>