b:color | border-color: color;
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b:current | border-color: currentColor;
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bt:current | border-top-color: currentColor;
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bb:current | border-bottom-color: currentColor;
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bl:current | border-left-color: currentColor;
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br:current | border-right-color: currentColor;
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bx:current | border-left-color: currentColor;
border-right-color: currentColor;
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by:current | border-top-color: currentColor;
border-bottom-color: currentColor;
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b:transparent | border-color: transparent;
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bt:transparent | border-top-color: transparent;
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bb:transparent | border-bottom-color: transparent;
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bl:transparent | border-left-color: transparent;
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br:transparent | border-right-color: transparent;
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bx:transparent | border-left-color: transparent;
border-right-color: transparent;
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by:transparent | border-top-color: transparent;
border-bottom-color: transparent;
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