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使用＜details＞标签在网页里面添加脚注

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使用 details 标签可以为文章添加相应注解
代码：

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    details, summary {
      display: inline;
      vertical-align: super;
      font-size: 0.75em;
    }
    summary {
      cursor: pointer;
    }
    details[open] {
      display: contents;
    }
    details[open]::before {
      content: " [";
    }
    details[open]::after {
      content: "]";
    }
  </style>
</head>
<body>
  The most cited work in history, for example, is a 1951 paper
   <details>
      <summary>1</summary>
      Lowry, O. H., Rosebrough, N. J., Farr, A. L. & Randall, R. J. J. Biol. Chem. 193, 265–275 (1951).
   </details>
describing an assay to determine the amount of protein in a solution.
</body>
</html>

效果如下：
rRBzkt.gif

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