css样式继承

CSS样式表继承指的是，特定的CSS属性向下传递到子孙元素。

可继承的样式：红色为文本相关属性，蓝色为列表相关属性。
    azimuth, border-collapse, border-spacing,
    caption-side, color, cursor, direction, elevation,
    empty-cells, font-family, font-size, font-style,
    font-variant, font-weight, font, letter-spacing,
    line-height, list-style-image, list-style-position,
    list-style-type, list-style, orphans, pitch-range,
    pitch, quotes, richness, speak-header, speaknumeral,
    speak-punctuation, speak, speechrate,
    stress, text-align, text-indent, text-transform,
    visibility, voice-family, volume, whitespace,
    widows, word-spacing
不可继承的样式：border padding margin width height ;

     值得注意的一点：Font-size的子类继承的不是实际值，而是计算后的值。相关请移步：
http://www.cnphp.info/css-style-inheritance.html