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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=469170
+-->
+<head>
+ <title>Test for Bug 469170</title>
+ <script src="/tests/SimpleTest/SimpleTest.js"></script>
+ <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body onload="runTest();">
+<p><a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=469170">Mozilla Bug 469170</a></p>
+
+<iframe id="source" width="50" height="50" srcdoc="<html></html>"></iframe>
+
+<pre id="test">
+<script type="application/javascript">
+
+/** Test for Bug 469170 **/
+
+SimpleTest.waitForExplicitFinish();
+
+function runTest() {
+ var source = document.getElementById('source').contentWindow;
+ rect = { left: 0, top: 0,
+ width: source.innerWidth, height: source.innerHeight };
+ var canvas = SpecialPowers.snapshotRect(source, rect, "transparent");
+ var context = canvas.getContext("2d");
+
+ var components = [ "red", "green", "blue", "alpha" ];
+
+ var data = context.getImageData(0, 0, canvas.width, canvas.height).data;
+ var failed = false;
+ for (var i = 0; i < data.length; i++) {
+ if (data[i] != 0) {
+ is(data[i], 0, "pixel " + Math.floor(i/4) + " " + components[i%4]);
+ failed = true;
+ }
+ }
+ if (!failed) {
+ ok(!failed, "all pixels fully transparent");
+ }
+ SimpleTest.finish();
+}
+</script>
+</pre>
+</body>
+</html>