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diff --git a/accessible/tests/browser/mac/browser_bounds.js b/accessible/tests/browser/mac/browser_bounds.js
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+++ b/accessible/tests/browser/mac/browser_bounds.js
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+/* 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";
+
+/**
+ * Test position, size for onscreen content
+ */
+addAccessibleTask(
+  `I am some extra content<br>
+   <div id="hello" style="display:inline;">hello</div><br>
+   <div id="world" style="display:inline;">hello world<br>I am some text</div>`,
+  async (browser, accDoc) => {
+    const hello = getNativeInterface(accDoc, "hello");
+    const world = getNativeInterface(accDoc, "world");
+    ok(hello.getAttributeValue("AXFrame"), "Hello's frame attr is not null");
+    ok(world.getAttributeValue("AXFrame"), "World's frame attr is not null");
+
+    // AXSize and AXPosition are composed of AXFrame components, so we
+    // test them here instead of calling AXFrame directly.
+    const [helloWidth, helloHeight] = hello.getAttributeValue("AXSize");
+    const [worldWidth, worldHeight] = world.getAttributeValue("AXSize");
+    ok(helloWidth > 0, "Hello has a positive width");
+    ok(helloHeight > 0, "Hello has a positive height");
+    ok(worldWidth > 0, "World has a positive width");
+    ok(worldHeight > 0, "World has a positive height");
+    ok(helloHeight < worldHeight, "Hello has a smaller height than world");
+    ok(helloWidth < worldWidth, "Hello has a smaller width than world");
+
+    // Note: these are mac screen coords, so our origin is bottom left
+    const [helloX, helloY] = hello.getAttributeValue("AXPosition");
+    const [worldX, worldY] = world.getAttributeValue("AXPosition");
+    ok(helloX > 0, "Hello has a positive X");
+    ok(helloY > 0, "Hello has a positive Y");
+    ok(worldX > 0, "World has a positive X");
+    ok(worldY > 0, "World has a positive Y");
+    ok(helloY > worldY, "Hello has a larger Y than world");
+    ok(helloX == worldX, "Hello and world have the same X");
+  }
+);
+
+/**
+ * Test position, size for offscreen content
+ */
+addAccessibleTask(
+  `I am some extra content<br>
+   <div id="hello" style="display:inline; position:absolute; left:-2000px;">hello</div><br>
+   <div id="world" style="display:inline; position:absolute; left:-2000px;">hello world<br>I am some text</div>`,
+  async (browser, accDoc) => {
+    const hello = getNativeInterface(accDoc, "hello");
+    const world = getNativeInterface(accDoc, "world");
+    ok(hello.getAttributeValue("AXFrame"), "Hello's frame attr is not null");
+    ok(world.getAttributeValue("AXFrame"), "World's frame attr is not null");
+
+    // AXSize and AXPosition are composed of AXFrame components, so we
+    // test them here instead of calling AXFrame directly.
+    const [helloWidth, helloHeight] = hello.getAttributeValue("AXSize");
+    const [worldWidth, worldHeight] = world.getAttributeValue("AXSize");
+    ok(helloWidth > 0, "Hello has a positive width");
+    ok(helloHeight > 0, "Hello has a positive height");
+    ok(worldWidth > 0, "World has a positive width");
+    ok(worldHeight > 0, "World has a positive height");
+    ok(helloHeight < worldHeight, "Hello has a smaller height than world");
+    ok(helloWidth < worldWidth, "Hello has a smaller width than world");
+
+    // Note: these are mac screen coords, so our origin is bottom left
+    const [helloX, helloY] = hello.getAttributeValue("AXPosition");
+    const [worldX, worldY] = world.getAttributeValue("AXPosition");
+    ok(helloX < 0, "Hello has a negative X");
+    ok(helloY > 0, "Hello has a positive Y");
+    ok(worldX < 0, "World has a negative X");
+    ok(worldY > 0, "World has a positive Y");
+    ok(helloY > worldY, "Hello has a larger Y than world");
+    ok(helloX == worldX, "Hello and world have the same X");
+  }
+);