一个打开/可见的 <details> 元素

          <details open>
  <summary>Copyright 1999-2011.</summary>
  <p> - by Refsnes Data. All Rights Reserved.</p>
  <p>All content and graphics on this web site are the property of the company Refsnes Data.</p>
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一个 打开/可见 的 <details> 元素