Test that plugin documents are not accessible

Follows whatwg/html#6947.
web-platform-tests · Aug 9, 2021 · 695d629 · 695d629
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diff --git a/html/browsers/browsing-the-web/navigating-across-documents/plugin-document.historical.html b/html/browsers/browsing-the-web/navigating-across-documents/plugin-document.historical.html
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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Same-origin PDFs must not create accessible Document objects</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<!-- https://github.com/whatwg/html/pull/6947 -->
+
+<iframe src="resources/portable-document-format-sample-valid.pdf"></iframe>
+
+<script>
+setup({ explicit_done: true });
+
+window.onload = () => {
+  test(() => {
+    assert_throws_dom("SecurityError", () => {
+      document.querySelector("iframe").contentWindow.document;
+    });
+  });
+  done();
+};
+</script>
diff --git a/...g-the-web/navigating-across-documents/resources/portable-document-format-sample-valid.pdf b/...g-the-web/navigating-across-documents/resources/portable-document-format-sample-valid.pdf
diff --git a/...b/navigating-across-documents/resources/portable-document-format-sample-valid.pdf.headers b/...b/navigating-across-documents/resources/portable-document-format-sample-valid.pdf.headers
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+Content-Type: application/pdf