1 files changed, 72 insertions, 0 deletions
diff --git a/accessible/tests/browser/bounds/browser_test_resolution.js b/accessible/tests/browser/bounds/browser_test_resolution.js
new file mode 100644
index 0000000000..0b0b47418d
--- /dev/null
+++ b/accessible/tests/browser/bounds/browser_test_resolution.js
@@ -0,0 +1,72 @@
+/* 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 */
+
+async function testScaledBounds(browser, accDoc, scale, id, type = "object") {
+  let acc = findAccessibleChildByID(accDoc, id);
+
+  // Get document offset
+  let [docX, docY] = getBounds(accDoc);
+
+  // Get the unscaled bounds of the accessible
+  let [x, y, width, height] =
+    type == "text"
+      ? getRangeExtents(acc, 0, -1, COORDTYPE_SCREEN_RELATIVE)
+      : getBounds(acc);
+
+  await invokeContentTask(browser, [scale], _scale => {
+    const { Layout } = ChromeUtils.importESModule(
+      "chrome://mochitests/content/browser/accessible/tests/browser/Layout.sys.mjs"
+    );
+    Layout.setResolution(content.document, _scale);
+  });
+
+  let [scaledX, scaledY, scaledWidth, scaledHeight] =
+    type == "text"
+      ? getRangeExtents(acc, 0, -1, COORDTYPE_SCREEN_RELATIVE)
+      : getBounds(acc);
+
+  let name = prettyName(acc);
+  isWithin(scaledWidth, width * scale, 2, "Wrong scaled width of " + name);
+  isWithin(scaledHeight, height * scale, 2, "Wrong scaled height of " + name);
+  isWithin(scaledX - docX, (x - docX) * scale, 2, "Wrong scaled x of " + name);
+  isWithin(scaledY - docY, (y - docY) * scale, 2, "Wrong scaled y of " + name);
+
+  await invokeContentTask(browser, [], () => {
+    const { Layout } = ChromeUtils.importESModule(
+      "chrome://mochitests/content/browser/accessible/tests/browser/Layout.sys.mjs"
+    );
+    Layout.setResolution(content.document, 1.0);
+  });
+}
+
+async function runTests(browser, accDoc) {
+  // The scrollbars get in the way of container bounds calculation.
+  await SpecialPowers.pushPrefEnv({
+    set: [["ui.useOverlayScrollbars", 1]],
+  });
+
+  await testScaledBounds(browser, accDoc, 2.0, "p1");
+  await testScaledBounds(browser, accDoc, 0.5, "p2");
+  await testScaledBounds(browser, accDoc, 3.5, "b1");
+
+  await testScaledBounds(browser, accDoc, 2.0, "p1", "text");
+  await testScaledBounds(browser, accDoc, 0.75, "p2", "text");
+}
+
+/**
+ * Test accessible boundaries when page is zoomed
+ */
+addAccessibleTask(
+  `
+<p id='p1' style='font-family: monospace;'>Tilimilitryamdiya</p>
+<p id="p2">para 2</p>
+<button id="b1">Hello</button>
+`,
+  runTests,
+  { iframe: true, remoteIframe: true }
+);