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diff --git a/dom/security/test/general/test_allow_opening_data_pdf.html b/dom/security/test/general/test_allow_opening_data_pdf.html
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+<!DOCTYPE HTML>
+<html>
+<head>
+ <meta charset="utf-8">
+ <title>Bug 1398692: Allow toplevel navigation to a data:application/pdf</title>
+ <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+ <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+function test_toplevel_data_pdf() {
+ // The PDF contains one page and it is a 3/72" square, the minimum allowed by the spec
+ const DATA_PDF =
+ "data:application/pdf;base64,JVBERi0xLjANCjEgMCBvYmo8PC9UeXBlL0NhdGFsb2cvUGFnZXMgMiAwIFI+PmVuZG9iaiAyIDAgb2JqPDwvVHlwZS9QYWdlcy9LaWRzWzMgMCBSXS9Db3VudCAxPj5lbmRvYmogMyAwIG9iajw8L1R5cGUvUGFnZS9NZWRpYUJveFswIDAgMyAzXT4+ZW5kb2JqDQp4cmVmDQowIDQNCjAwMDAwMDAwMDAgNjU1MzUgZg0KMDAwMDAwMDAxMCAwMDAwMCBuDQowMDAwMDAwMDUzIDAwMDAwIG4NCjAwMDAwMDAxMDIgMDAwMDAgbg0KdHJhaWxlcjw8L1NpemUgNC9Sb290IDEgMCBSPj4NCnN0YXJ0eHJlZg0KMTQ5DQolRU9G";
+
+ let win = window.open(DATA_PDF);
+ let wrappedWin = SpecialPowers.wrap(win);
+
+ // Unfortunately we can't detect whether the PDF has loaded or not using some
+ // event, hence we are constantly polling location.href till we see that
+ // the data: URI appears. Test times out on failure.
+ var pdfLoaded = setInterval(function() {
+ if (wrappedWin.document.location.href.startsWith("data:application/pdf")) {
+ clearInterval(pdfLoaded);
+ ok(true, "navigating to data:application/pdf allowed");
+ wrappedWin.close();
+ SimpleTest.finish();
+ }
+ }, 200);
+}
+
+SpecialPowers.pushPrefEnv({
+ set: [["security.data_uri.block_toplevel_data_uri_navigations", true]]
+}, test_toplevel_data_pdf);
+
+</script>
+</body>
+</html>