A div with border-width specified is not correctly located by Selenium.prototype.getElementPositionTop. and Selenium.prototype.getElementPositionLeft in Firefox.

Something similar to this was reported at http://clearspace.openqa.org/message/32718#32718

Details: I've got some sample HTML with a top-level div with

<div style="border-width: 10px 20px 30px 40px; width: 55px; height: 66px; min-width: 150px; min-height: 26px; left: 100px; top: 100px;" ... snip ...>

There are other divs within this div eventually getting some divs with text content, the first being "Expired". The other divs have 0 border width. Executing Selenium commands in Selenium IDE show that the position calculated is wrong:

# [info] Executing: |assertElementPositionLeft | //div[text()="Expired"] | 140 |
# [error] Actual value '60' did not match '140'
# [info] Executing: |assertElementPositionTop | //div[text()="Expired"] | 110 |
# [error] Actual value '91' did not match '110'

This is an issue because the code is an extract from an AJAX package which has created a popup list under a combo box. We're trying to get the Selenium code to automatically select entries in the popup list, so use something like clickAt (actually a variant supplied by the AJAX provider, qooxdoo, which doesn't have x,y offset). However, the x.y posiiton sent to the Javascript is out by 1 pixel so gets rejected by the mouse handling code as being off the menu.

In the example I have attached here I have exagerated the border so the effect can be seen more clearly.

Hugh