CSS Layout - 如何使用媒体查询控制列计数

我们想知道如何使用媒体查询控制列计数。

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The column-count property controls how many 
vertical columns text will be 
broken into. 
<!DOCTYPE html>
<html>
<head>
  <style type='text/css'>
article p {
    -moz-column-rule: 1px solid #ccc;
    -webkit-column-rule: 1px solid #ccc;
    column-rule: 1px solid #ccc;
    -moz-column-gap: 1.5em;
    -webkit-column-gap: 1.5em;
    column-gap: 1.5em;
}
@media only screen and (min-width: 500px) {
  article p {
    -moz-column-count: 3;
    -webkit-column-count: 3;
    column-count: 3;      
  }
}
  </style>
</head>
<body>
  <section>
    Drag the windows smaller to see 3 columns revert to single column...
    <article>
        <p>This is a test. This is a test. This is a test. This is a test. 
        This is a test. This is a test. This is a test. This is a test. 
 
 
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CSS Layout - 如何使用媒体查询控制列计数
