column-rule-style

CSS 特性 column-rule-color 让你可以设置在多列布局中被画在两列之间的规则（线条）的样式。

Formal syntax: 
column-rule-style = 
  <line-style>  

<line-style> = 
  none    |
  hidden  |
  dotted  |
  dashed  |
  solid   |
  double  |
  groove  |
  ridge   |
  inset   |
  outset  

column-rule-style: none;
column-rule-style: hidden;
column-rule-style: dotted;
column-rule-style: dashed;
column-rule-style: solid;
column-rule-style: double;
column-rule-style: groove;
column-rule-style: ridge;
column-rule-style: inset;
column-rule-style: outset;

column-rule-style: inherit;

<br-style>

Is a keyword defined by border-style describing the style of the rule. The styling must be interpreted as in the collapsing border model.