HSLA 颜色值得到以下浏览器的支持：IE9+、Firefox 3+、Chrome、Safari 以及 Opera 10+。 HSLA 颜色值是 HSL 颜色值的扩展，带有一个 alpha 通道 - 它规定了对象的不透明度。 H：Hue(色调)。0(或360)表示红色，120表示绿色，240表示蓝色，也可取其他数值来指定颜色。取值为：0 ...

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