1 files changed, 20 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/webappapis/dynamic-markup-insertion/opening-the-input-stream/bailout-side-effects-xml.window.js b/testing/web-platform/tests/html/webappapis/dynamic-markup-insertion/opening-the-input-stream/bailout-side-effects-xml.window.js
new file mode 100644
index 0000000000..bbfc015c68
--- /dev/null
+++ b/testing/web-platform/tests/html/webappapis/dynamic-markup-insertion/opening-the-input-stream/bailout-side-effects-xml.window.js
@@ -0,0 +1,20 @@
+// META: script=resources/document-open-side-effects.js
+
+async_test(t => {
+  const iframe = document.body.appendChild(document.createElement("iframe"));
+  t.add_cleanup(() => iframe.remove());
+  iframe.src = "/common/dummy.xhtml";
+  iframe.onload = t.step_func_done(() => {
+    const origURL = iframe.contentDocument.URL;
+    assertDocumentIsReadyForSideEffectsTest(iframe.contentDocument, "XML document");
+    assert_throws_dom(
+      "InvalidStateError",
+      iframe.contentWindow.DOMException,
+      () => {
+        iframe.contentDocument.open();
+      },
+      "document.open() should throw on XML documents"
+    );
+    assertOpenHasNoSideEffects(iframe.contentDocument, origURL, "XML document");
+  });
+}, "document.open bailout should not have any side effects (XML document)");