jquery css interpreter issue in IE8 Standards Mode

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Expected behavior: jQuery.css("border-left-width") should report the same way on all browsers.

Actual behavior: jQuery.css("border-left-width") breaks in ie8 Standards mode when there are duplicate css entries.

I noticed that only in ie8 Standards Mode my tables were not resizing properly and after debugging noticed that my css for the table had a duplicate entry. There must be a difference in the way that jquery.<object>.css("border-left-width") responds in ie8 Standards Mode as the following css renders correctly in ie7 and ie9 Standards Modes, but not in ie8 Standard Mode:

table {
 border: 8px solid #C2DDEE;
 border: none;
}

[timmywil]

Duplicate of #14266.