Add a WPT to check for standards mode plugin document

The [1] PR will change the standard so that plugin documents are in standard (no quirks) mode. This CL adds a test, as much as this is testable. Some UAs display PDF documents using "content that uses plugins" [2] while others use "inline content that doesn't have a DOM [3]. This test will pass in either case. Chromium already made this change in code in Sept 2020 (see CLs on crbug.com/1131185) and found no compat issues. [1] whatwg/html#6745 [2] https://html.spec.whatwg.org/#read-plugin [3] https://html.spec.whatwg.org/#read-ua-inline Bug: 1131185 Change-Id: Iccd1668199ac8b3b1c90a69b97a0adbaf8d02655
web-platform-tests · Jun 8, 2021 · 288e4f9 · 288e4f9
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diff --git a/html/browsers/browsing-the-web/read-plugin/load-plugin.html b/html/browsers/browsing-the-web/read-plugin/load-plugin.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<title>Page load processing model for plugins</title>
+<link rel="author" href="masonf@chromium.org">
+<link rel="help" href="https://html.spec.whatwg.org/#read-plugin">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="log"></div>
+
+<object type="application/pdf" data="support/sandbox.pdf"></object>
+
+<script>
+const t = async_test("Checking document metadata for PDF file");
+const obj = document.querySelector('object');
+obj.onload = () => {
+  t.step(function() {
+    const doc = obj.contentDocument;
+    if (doc === null) {
+      // Some UA's render PDF as "inline content that doesn't have a DOM", which is ok
+      t.done();
+    } else {
+      assert_equals(doc.compatMode, "CSS1Compat");
+      assert_equals(doc.contentType, "application/pdf");
+      t.done();
+    }
+  });
+};
+</script>
diff --git a/html/browsers/browsing-the-web/read-plugin/support/sandbox.pdf b/html/browsers/browsing-the-web/read-plugin/support/sandbox.pdf