Use spaces to separate the values, not commas.
Be aware that the values work clockwise starting at the top, so your figures will produce a "shadow" effect, with a wider border to the right and bottom.
Also, if there is not a full set of four values then the missing values take theirs from the opposite side. i.e.
border="1 2 3" is the equivalent of:
border-top: 1;
border-right: 2;
border-bottom: 3;
border-left: 2;
and border="1 2" is the equivalent of
border-top: 1;
border-right: 2;
border-bottom: 1;
border-left: 2;
Optionally, you can add units as well, eg
border="1px 2em"
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