1 files changed, 105 insertions, 0 deletions
diff --git a/accessible/tests/browser/e10s/browser_treeupdate_csscontentvisibility.js b/accessible/tests/browser/e10s/browser_treeupdate_csscontentvisibility.js
new file mode 100644
index 0000000000..8a1f93d0be
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+++ b/accessible/tests/browser/e10s/browser_treeupdate_csscontentvisibility.js
@@ -0,0 +1,105 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+/* import-globals-from ../../mochitest/role.js */
+loadScripts({ name: "role.js", dir: MOCHITESTS_DIR });
+
+const snippet = `
+  <style>
+    #target {
+      width: 150px;
+      height: 150px;
+      background-color: lightblue;
+    }
+    #child {
+      width: 100px;
+      height: 100px;
+      background-color: lightgreen;
+    }
+    #content-child {
+      width: 100px;
+      height: 100px;
+      background-color: green;
+      display: contents;
+    }
+    .hidden {
+      content-visibility: hidden;
+    }
+    .auto {
+      content-visibility: auto;
+    }
+    #hidden-subtree-2 {
+      visibility: hidden;
+    }
+  </style>
+  <div class="hidden" id="target">
+    <div id="child">A</div>
+    <div id="content-child">B</div>
+    <div id="hidden-subtree-1" class="hidden">C</div>
+    <div id="hidden-subtree-2">D</div>
+    <div id="shadow-host"></div>
+  </div>
+  <script>
+    const host = document.querySelector("#shadow-host");
+    const shadowRoot = host.attachShadow({ mode: "open" });
+    shadowRoot.innerHTML = "<div id='shadowDiv'>E</div>";
+  </script>
+  `;
+
+add_setup(async function () {
+  await SpecialPowers.pushPrefEnv({
+    set: [["layout.css.content-visibility.enabled", true]],
+  });
+});
+
+async function setContentVisibility(browser, value) {
+  let mutationPromise = (() => {
+    switch (value) {
+      case "hidden":
+        return waitForEvent(EVENT_REORDER, "target");
+      case "auto":
+        return waitForEvents({
+          expected: [
+            [EVENT_REORDER, "child"],
+            [EVENT_REORDER, "content-child"],
+            [EVENT_REORDER, "shadowDiv"],
+            [EVENT_REORDER, "target"],
+          ],
+        });
+      default:
+        throw new Error(`unexpected content-visibility: ${value}`);
+    }
+  })();
+
+  // Change the value of `content-visibility` property for the target
+  info(`Setting content-visibility: ${value}`);
+  await invokeSetAttribute(browser, "target", "class", value);
+  await mutationPromise;
+}
+
+addAccessibleTask(
+  snippet,
+  async function (browser, accDoc) {
+    const target = findAccessibleChildByID(accDoc, "target");
+
+    info("Initial Accessibility Structure Test");
+    testAccessibleTree(target, { SECTION: [] });
+
+    await setContentVisibility(browser, "auto");
+    testAccessibleTree(target, {
+      SECTION: [
+        { SECTION: [{ TEXT_LEAF: [] }] } /* child */,
+        { SECTION: [{ TEXT_LEAF: [] }] } /* content-child */,
+        { SECTION: [] } /* hidden-subtree-1 */,
+        { SECTION: [{ SECTION: [{ TEXT_LEAF: [] }] }] } /* shadow-host */,
+      ],
+    });
+
+    await setContentVisibility(browser, "hidden");
+    testAccessibleTree(target, { SECTION: [] });
+  },
+  { iframe: true, remoteIframe: true, chrome: true }
+);