当球被画时，边界半径意味着边缘是消除锯齿的。
When the ball is painted, the border radius means that the edges are anti-aliased.
为什么不工作边界半径在IE9的但在IE10或铬？
Why doesn't work border-radius in IE9 but in IE10 or Chrome?
CSS3边界半径2日横跨在标题，这种影响有可能吗？
CSS3 border radius on 2 spans within heading, is this effect possible?
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