The event.clientX/Y values for the text portion of disabled INPUT elements is reported relative to the left/top of the INPUT element and not the viewport if the INPUT element is in a table.
Test page Workaround is not included
Reported by: Jason Brunette.
Explorer 5-6 Windows, Explorer 7 | Reported on 15 March 2006.
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1 Posted by Simon Richardson on 15 March 2006 | Permalink
Although this is a bug within a bug, Safari/Opera also exhibits part of the bug by firing mouse events over disabled input element
Browser
Safari version 2.0.3/Opera version 8.51 - I will test on older browsers, but I a guess that this happens in all previous versions.