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Probably this problem is a bug of chrome...

This property of css does not work.
:after { content: element; } or ignore inline element of empty..

but, "star a { display: inline-block; }" add this property, it works.
for ie add has-layout property...

I want you to change it ;D

Source:
<span class="stars standard-vote-widget"><a href="#" class="star star-0 star-off star-unset star-set-after"></a><a href="#" class="star star-1 star-off star-unset star-set-after"></a><a href="#" class="star star-2 star-off star-unset star-set-after"></a><a href="#" class="star star-3 star-off star-unset star-set-after"></a><span class="vote-up-block"><a class="star vote-up" href="#"></a></span></span>