1 files changed, 84 insertions, 0 deletions
diff --git a/accessible/tests/browser/hittest/browser_test_text.js b/accessible/tests/browser/hittest/browser_test_text.js
new file mode 100644
index 0000000000..130f077f29
--- /dev/null
+++ b/accessible/tests/browser/hittest/browser_test_text.js
@@ -0,0 +1,84 @@
+/* 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";
+
+addAccessibleTask(
+  `
+a
+<div id="noChars" style="width: 5px; height: 5px;"><p></p></div>
+<p id="twoText"><span>a</span><span>b</span></p>
+<div id="iframeAtEnd" style="width: 20px; height: 20px;">
+  a
+  <iframe width="1" height="1"></iframe>
+</div>
+<button id="pointBeforeText">
+  <div style="display: flex;">
+    <div style="width: 100px; background-color: red;" role="none"></div>
+    test
+    <div style="width: 100px; background-color: blue;" role="none"></div>
+  </div>
+</button>
+  `,
+  async function (browser, docAcc) {
+    const dpr = await getContentDPR(browser);
+    // Test getOffsetAtPoint on a container containing no characters. The inner
+    // container does not include the requested point, but the outer one does.
+    const noChars = findAccessibleChildByID(docAcc, "noChars", [
+      Ci.nsIAccessibleText,
+    ]);
+    let [x, y] = Layout.getBounds(noChars, dpr);
+    await testOffsetAtPoint(noChars, x, y, COORDTYPE_SCREEN_RELATIVE, -1);
+
+    // Test that the correct offset is returned for a point in a second text
+    // leaf.
+    const twoText = findAccessibleChildByID(docAcc, "twoText", [
+      Ci.nsIAccessibleText,
+    ]);
+    const text2 = twoText.getChildAt(1);
+    [x, y] = Layout.getBounds(text2, dpr);
+    await testOffsetAtPoint(twoText, x, y, COORDTYPE_SCREEN_RELATIVE, 1);
+
+    // Test offsetAtPoint when there is an iframe at the end of the container.
+    const iframeAtEnd = findAccessibleChildByID(docAcc, "iframeAtEnd", [
+      Ci.nsIAccessibleText,
+    ]);
+    let width;
+    let height;
+    [x, y, width, height] = Layout.getBounds(iframeAtEnd, dpr);
+    x += width - 1;
+    y += height - 1;
+    await testOffsetAtPoint(iframeAtEnd, x, y, COORDTYPE_SCREEN_RELATIVE, -1);
+
+    // Test that 0 is returned if the point is within the container but before
+    // the rectangle at offset 0. This is buggy behavior that some users have
+    // unfortunately come to rely on (bug 1816601).
+    const pointBeforeText = findAccessibleChildByID(docAcc, "pointBeforeText", [
+      Ci.nsIAccessibleText,
+    ]);
+    [x, y, width, height] = Layout.getBounds(pointBeforeText, dpr);
+    await testOffsetAtPoint(
+      pointBeforeText,
+      x + 1,
+      y + 1,
+      COORDTYPE_SCREEN_RELATIVE,
+      0
+    );
+    // But this buggy behavior only applies for a point before offset 0, not
+    // a point after the last offset. So it's asymmetrically buggy. :(
+    await testOffsetAtPoint(
+      pointBeforeText,
+      x + width - 1,
+      y + height - 1,
+      COORDTYPE_SCREEN_RELATIVE,
+      -1
+    );
+  },
+  {
+    topLevel: true,
+    iframe: true,
+    remoteIframe: true,
+    chrome: true,
+  }
+);