Walk the entire offsetParent chain in fast/forms/resources/common.js utility functions.

third_party/WebKit/LayoutTests/fast/forms/resources/common.js

 function $(id) {
     return document.getElementById(id);
 }
 
 function createFormControlDataSet() {
     // A list of labelable elements resides in http://www.whatwg.org/specs/web-apps/current-work/multipage/forms.html#category-label
     var formControlClassNames = [
         'HTMLButtonElement',
         'HTMLDataListElement',
         'HTMLFieldSetElement',
@@ skipping 78 matching lines @@
 function getAbsoluteRect(element) {
     var rect = element.getBoundingClientRect();
     rect.top += document.scrollingElement.scrollTop;
     rect.bottom += document.scrollingElement.scrollTop;
     rect.left += document.scrollingElement.scrollLeft;
     rect.right += document.scrollingElement.scrollLeft;
     return rect;
 }
 
 function searchCancelButtonPosition(element) {
+    var offset = cumulativeOffset(element);
     var pos = {};
-    pos.x = element.offsetLeft + element.offsetWidth - 9;
-    pos.y = element.offsetTop + element.offsetHeight / 2;
+    pos.x = offset[0] + element.offsetWidth - 9;
+    pos.y = offset[1] + element.offsetHeight / 2;
     return pos;
 }
 
 function rtlSearchCancelButtonPosition(element) {
+    var offset = cumulativeOffset(element);
     var pos = {};
-    pos.x = element.offsetLeft + 9;
-    pos.y = element.offsetTop + element.offsetHeight / 2;
+    pos.x = offset[0] + 9;
+    pos.y = offset[1] + element.offsetHeight / 2;
     return pos;
 }
 
 function mouseMoveToIndexInListbox(index, listboxId) {
     var listbox = document.getElementById(listboxId);
     var itemHeight = Math.floor(listbox.offsetHeight / listbox.size);
     var border = 1;
     var y = border + index * itemHeight;
     if (window.eventSender)
         eventSender.mouseMoveTo(listbox.offsetLeft + border, listbox.offsetTop + y - window.pageYOffset);
@@ skipping 110 matching lines @@
         return;
     }
     for (var i = 0; i < str.length; ++i) {
         var key = str.charAt(i);
         if (key == '\n')
             key = 'Enter';
         eventSender.keyDown(key);
     }
 }