test_ext_shadowdom.js

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"use strict";

// ExtensionContent.sys.mjs 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();

});