1 files changed, 59 insertions, 0 deletions
diff --git a/toolkit/components/extensions/test/xpcshell/test_ext_shadowdom.js b/toolkit/components/extensions/test/xpcshell/test_ext_shadowdom.js
new file mode 100644
index 0000000000..626d8de22d
--- /dev/null
+++ b/toolkit/components/extensions/test/xpcshell/test_ext_shadowdom.js
@@ -0,0 +1,59 @@
+"use strict";
+
+// ExtensionContent.jsm needs to know when it's running from xpcshell,
+// to use the right timeout for content scripts executed at document_idle.
+ExtensionTestUtils.mockAppInfo();
+
+const server = createHttpServer();
+server.registerDirectory("/data/", do_get_file("data"));
+
+const BASE_URL = `http://localhost:${server.identity.primaryPort}/data`;
+
+add_task(async function test_contentscript_shadowDOM() {
+  function backgroundScript() {
+    browser.test.assertTrue(
+      "openOrClosedShadowRoot" in document.documentElement,
+      "Should have openOrClosedShadowRoot in Element in background script."
+    );
+  }
+
+  function contentScript() {
+    let host = document.getElementById("host");
+    browser.test.assertTrue(
+      "openOrClosedShadowRoot" in host,
+      "Should have openOrClosedShadowRoot in Element."
+    );
+    let shadowRoot = host.openOrClosedShadowRoot;
+    browser.test.assertEq(
+      shadowRoot.mode,
+      "closed",
+      "Should have closed ShadowRoot."
+    );
+    browser.test.sendMessage("contentScript");
+  }
+
+  let extension = ExtensionTestUtils.loadExtension({
+    manifest: {
+      content_scripts: [
+        {
+          matches: ["http://*/*/file_shadowdom.html"],
+          js: ["content_script.js"],
+        },
+      ],
+    },
+    background: backgroundScript,
+    files: {
+      "content_script.js": contentScript,
+    },
+  });
+
+  await extension.startup();
+
+  let contentPage = await ExtensionTestUtils.loadContentPage(
+    `${BASE_URL}/file_shadowdom.html`
+  );
+  await extension.awaitMessage("contentScript");
+
+  await contentPage.close();
+  await extension.unload();
+});