1 files changed, 67 insertions, 0 deletions
diff --git a/accessible/tests/browser/scroll/browser_test_scroll_substring.js b/accessible/tests/browser/scroll/browser_test_scroll_substring.js
new file mode 100644
index 0000000000..e8426d00ca
--- /dev/null
+++ b/accessible/tests/browser/scroll/browser_test_scroll_substring.js
@@ -0,0 +1,67 @@
+/* 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/layout.js */
+loadScripts({ name: "layout.js", dir: MOCHITESTS_DIR });
+
+/**
+ * Test nsIAccessibleText::scrollSubstringTo.
+ */
+addAccessibleTask(
+  `
+  <style>
+    @font-face {
+      font-family: Ahem;
+      src: url(${CURRENT_CONTENT_DIR}e10s/fonts/Ahem.sjs);
+    }
+    pre {
+      font: 20px/20px Ahem;
+      height: 40px;
+      overflow-y: scroll;
+    }
+  </style>
+  <pre id="text">
+
+
+
+
+
+It's a jetpack, Michael. What could possibly go wrong?
+
+
+
+
+
+The only thing I found in the fridge was a dead dove in a bag.
+</pre>`,
+  async function (browser, docAcc) {
+    let text = findAccessibleChildByID(docAcc, "text", [nsIAccessibleText]);
+    let [, containerY, , containerHeight] = getBounds(text);
+    let getCharY = () => {
+      let objY = {};
+      text.getCharacterExtents(7, {}, objY, {}, {}, COORDTYPE_SCREEN_RELATIVE);
+      return objY.value;
+    };
+    ok(
+      containerHeight < getCharY(),
+      "Character is outside of container bounds"
+    );
+    text.scrollSubstringTo(7, 8, SCROLL_TYPE_TOP_EDGE);
+
+    await waitForContentPaint(browser);
+    await untilCacheIs(
+      getCharY,
+      containerY,
+      "Character is scrolled to top of container"
+    );
+  },
+  {
+    topLevel: true,
+    iframe: true,
+    remoteIframe: true,
+    chrome: true,
+  }
+);